sudo ethtool -K eth0 tso off
didnt help when the system was acting up, but the output of dmesg is different this time, looks ufw related?
[ 4.683500] r8169 0000:04:00.0 eth0: RTL8168h/8111h, a8:a1:59:46:c5:f2, XID 541, IRQ 73
[ 4.683505] r8169 0000:04:00.0 eth0: jumbo features [frames: 9194 bytes, tx checksumming: ko]
[ 6.818366] r8169 0000:04:00.0 eth0: Link is Down
[ 9.726930] r8169 0000:04:00.0 eth0: Link is Up - 1Gbps/Full - flow control rx/tx
[ 9.727917] r8169 0000:04:00.0 eth0: Link is Down
[ 13.344672] r8169 0000:04:00.0 eth0: Link is Up - 1Gbps/Full - flow control rx/tx
[ 14.733266] [UFW BLOCK] IN=eth0 OUT= MAC=33:33:00:00:00:01:00:11:22:ab:cd:ee:86:dd SRC=2604:3d09:888b:0800:0211:22ff:feab:cdee DST=ff02:0000:0000:0000:0000:0000:0000:0001 LEN=72 TC=0 HOPLIMIT=255 FLOWLBL=0 PROTO=ICMPv6 TYPE=136 CODE=0 MARK=0x3214
[ 15.397160] [UFW BLOCK] IN=eth0 OUT= MAC=33:33:00:00:00:01:f8:5e:42:9d:02:d5:86:dd SRC=fe80:0000:0000:0000:fa5e:42ff:fe9d:02d5 DST=ff02:0000:0000:0000:0000:0000:0000:0001 LEN=120 TC=0 HOPLIMIT=255 FLOWLBL=377250 PROTO=ICMPv6 TYPE=134 CODE=0 MARK=0x3214
[ 15.400797] [UFW BLOCK] IN=eth0 OUT= MAC=a8:a1:59:46:c5:f2:f8:5e:42:9d:02:d5:86:dd SRC=fe80:0000:0000:0000:fa5e:42ff:fe9d:02d5 DST=fe80:0000:0000:0000:9f22:3cbe:cb33:b155 LEN=199 TC=0 HOPLIMIT=64 FLOWLBL=338803 PROTO=UDP SPT=547 DPT=546 LEN=159 MARK=0x3214
[ 15.730320] [UFW BLOCK] IN=eth0 OUT= MAC=a8:a1:59:46:c5:f2:f8:5e:42:9d:02:d5:86:dd SRC=fe80:0000:0000:0000:fa5e:42ff:fe9d:02d5 DST=fe80:0000:0000:0000:9f22:3cbe:cb33:b155 LEN=132 TC=0 HOPLIMIT=64 FLOWLBL=184250 PROTO=ICMPv6 TYPE=1 CODE=2 [SRC=fe80:0000:0000:0000:9f22:3cbe:cb33:b155 DST=2620:00fe:0000:0000:0000:0000:0000:00fe LEN=84 TC=0 HOPLIMIT=64 FLOWLBL=690630 PROTO=UDP SPT=50144 DPT=53 LEN=44 ] MARK=0x3214
[ 15.730849] [UFW BLOCK] IN=eth0 OUT= MAC=a8:a1:59:46:c5:f2:f8:5e:42:9d:02:d5:86:dd SRC=fe80:0000:0000:0000:fa5e:42ff:fe9d:02d5 DST=fe80:0000:0000:0000:9f22:3cbe:cb33:b155 LEN=132 TC=0 HOPLIMIT=64 FLOWLBL=184250 PROTO=ICMPv6 TYPE=1 CODE=2 [SRC=fe80:0000:0000:0000:9f22:3cbe:cb33:b155 DST=2620:00fe:0000:0000:0000:0000:0000:00fe LEN=84 TC=0 HOPLIMIT=64 FLOWLBL=690630 PROTO=UDP SPT=50144 DPT=53 LEN=44 ] MARK=0x3214
[ 15.731235] [UFW BLOCK] IN=eth0 OUT= MAC=a8:a1:59:46:c5:f2:f8:5e:42:9d:02:d5:86:dd SRC=fe80:0000:0000:0000:fa5e:42ff:fe9d:02d5 DST=fe80:0000:0000:0000:9f22:3cbe:cb33:b155 LEN=132 TC=0 HOPLIMIT=64 FLOWLBL=184250 PROTO=ICMPv6 TYPE=1 CODE=2 [SRC=fe80:0000:0000:0000:9f22:3cbe:cb33:b155 DST=2620:00fe:0000:0000:0000:0000:0000:0009 LEN=84 TC=0 HOPLIMIT=64 FLOWLBL=758633 PROTO=UDP SPT=60097 DPT=53 LEN=44 ] MARK=0x3214
[ 15.731591] [UFW BLOCK] IN=eth0 OUT= MAC=a8:a1:59:46:c5:f2:f8:5e:42:9d:02:d5:86:dd SRC=fe80:0000:0000:0000:fa5e:42ff:fe9d:02d5 DST=fe80:0000:0000:0000:9f22:3cbe:cb33:b155 LEN=132 TC=0 HOPLIMIT=64 FLOWLBL=184250 PROTO=ICMPv6 TYPE=1 CODE=2 [SRC=fe80:0000:0000:0000:9f22:3cbe:cb33:b155 DST=2620:00fe:0000:0000:0000:0000:0000:0009 LEN=84 TC=0 HOPLIMIT=64 FLOWLBL=758633 PROTO=UDP SPT=60097 DPT=53 LEN=44 ] MARK=0x3214
[ 15.731935] [UFW BLOCK] IN=eth0 OUT= MAC=a8:a1:59:46:c5:f2:f8:5e:42:9d:02:d5:86:dd SRC=fe80:0000:0000:0000:fa5e:42ff:fe9d:02d5 DST=fe80:0000:0000:0000:9f22:3cbe:cb33:b155 LEN=132 TC=0 HOPLIMIT=64 FLOWLBL=184250 PROTO=ICMPv6 TYPE=1 CODE=2 [SRC=fe80:0000:0000:0000:9f22:3cbe:cb33:b155 DST=2620:00fe:0000:0000:0000:0000:0000:00fe LEN=84 TC=0 HOPLIMIT=64 FLOWLBL=554013 PROTO=UDP SPT=57809 DPT=53 LEN=44 ] MARK=0x3214
[ 15.732217] [UFW BLOCK] IN=eth0 OUT= MAC=a8:a1:59:46:c5:f2:f8:5e:42:9d:02:d5:86:dd SRC=fe80:0000:0000:0000:fa5e:42ff:fe9d:02d5 DST=fe80:0000:0000:0000:9f22:3cbe:cb33:b155 LEN=132 TC=0 HOPLIMIT=64 FLOWLBL=184250 PROTO=ICMPv6 TYPE=1 CODE=2 [SRC=fe80:0000:0000:0000:9f22:3cbe:cb33:b155 DST=2620:00fe:0000:0000:0000:0000:0000:00fe LEN=84 TC=0 HOPLIMIT=64 FLOWLBL=554013 PROTO=UDP SPT=57809 DPT=53 LEN=44 ] MARK=0x3214
[ 16.202682] [UFW BLOCK] IN=eth0 OUT= MAC=33:33:00:00:00:01:00:11:22:ab:cd:ee:86:dd SRC=2604:3d09:888b:0800:0211:22ff:feab:cdee DST=ff02:0000:0000:0000:0000:0000:0000:0001 LEN=72 TC=0 HOPLIMIT=255 FLOWLBL=0 PROTO=ICMPv6 TYPE=136 CODE=0 MARK=0x3214
[ 16.765582] [UFW BLOCK] IN=eth0 OUT= MAC=33:33:00:00:00:01:f8:5e:42:9d:02:d5:86:dd SRC=fe80:0000:0000:0000:fa5e:42ff:fe9d:02d5 DST=ff02:0000:0000:0000:0000:0000:0000:0001 LEN=120 TC=0 HOPLIMIT=255 FLOWLBL=377250 PROTO=ICMPv6 TYPE=134 CODE=0 MARK=0x3214
[ 17.237115] [UFW BLOCK] IN=eth0 OUT= MAC=33:33:ff:fb:78:8e:f8:5e:42:9d:02:d5:86:dd SRC=fe80:0000:0000:0000:fa5e:42ff:fe9d:02d5 DST=ff02:0000:0000:0000:0000:0001:fffb:788e LEN=72 TC=0 HOPLIMIT=255 FLOWLBL=0 PROTO=ICMPv6 TYPE=135 CODE=0 MARK=0x3214
[ 17.237742] [UFW BLOCK] IN=eth0 OUT= MAC=a8:a1:59:46:c5:f2:f8:5e:42:9d:02:d5:86:dd SRC=2620:00fe:0000:0000:0000:0000:0000:00fe DST=2604:3d09:888b:0800:b66a:ad30:effb:788e LEN=123 TC=0 HOPLIMIT=57 FLOWLBL=5460 PROTO=UDP SPT=53 DPT=54893 LEN=83 MARK=0x3214
[ 18.698879] [UFW BLOCK] IN=eth0 OUT= MAC= SRC=10.0.0.101 DST=224.0.0.251 LEN=396 TOS=0x00 PREC=0x00 TTL=255 ID=60181 DF PROTO=UDP SPT=5353 DPT=5353 LEN=376 MARK=0x3214
[ 18.767559] [UFW BLOCK] IN=eth0 OUT= MAC=a8:a1:59:46:c5:f2:f8:5e:42:9d:02:d5:08:00 SRC=9.9.9.9 DST=10.0.0.101 LEN=103 TOS=0x00 PREC=0x00 TTL=60 ID=30039 PROTO=UDP SPT=53 DPT=60889 LEN=83 MARK=0x3214
[ 18.772953] [UFW BLOCK] IN=eth0 OUT= MAC=a8:a1:59:46:c5:f2:f8:5e:42:9d:02:d5:08:00 SRC=9.9.9.9 DST=10.0.0.101 LEN=115 TOS=0x00 PREC=0x00 TTL=60 ID=30040 PROTO=UDP SPT=53 DPT=60889 LEN=95 MARK=0x3214
[ 18.950114] [UFW BLOCK] IN=eth0 OUT= MAC= SRC=10.0.0.101 DST=224.0.0.251 LEN=396 TOS=0x00 PREC=0x00 TTL=255 ID=60202 DF PROTO=UDP SPT=5353 DPT=5353 LEN=376 MARK=0x3214
[ 19.200792] [UFW BLOCK] IN=eth0 OUT= MAC= SRC=10.0.0.101 DST=224.0.0.251 LEN=396 TOS=0x00 PREC=0x00 TTL=255 ID=60327 DF PROTO=UDP SPT=5353 DPT=5353 LEN=376 MARK=0x3214
[ 19.235340] [UFW BLOCK] IN=eth0 OUT= MAC=a8:a1:59:46:c5:f2:f8:5e:42:9d:02:d5:08:00 SRC=9.9.9.9 DST=10.0.0.101 LEN=103 TOS=0x00 PREC=0x00 TTL=60 ID=30118 PROTO=UDP SPT=53 DPT=55067 LEN=83 MARK=0x3214
[ 29.226628] [UFW BLOCK] IN=eth0 OUT= MAC=a8:a1:59:46:c5:f2:f8:5e:42:9d:02:d5:08:00 SRC=64.59.184.17 DST=10.0.0.101 LEN=103 TOS=0x00 PREC=0x00 TTL=61 ID=45740 PROTO=UDP SPT=53 DPT=35593 LEN=83 MARK=0x3214
[ 37.785173] [UFW BLOCK] IN=eth0 OUT= MAC=33:33:00:00:00:01:f8:5e:42:9d:02:d5:86:dd SRC=fe80:0000:0000:0000:fa5e:42ff:fe9d:02d5 DST=ff02:0000:0000:0000:0000:0000:0000:0001 LEN=120 TC=0 HOPLIMIT=255 FLOWLBL=377250 PROTO=ICMPv6 TYPE=134 CODE=0 MARK=0x3214
[ 48.876959] [UFW BLOCK] IN=eth0 OUT= MAC=a8:a1:59:46:c5:f2:f8:5e:42:9d:02:d5:08:00 SRC=9.9.9.9 DST=10.0.0.101 LEN=103 TOS=0x00 PREC=0x00 TTL=60 ID=33770 PROTO=UDP SPT=53 DPT=34990 LEN=83 MARK=0x3214
[ 55.799704] [UFW BLOCK] IN=eth0 OUT= MAC=33:33:00:00:00:01:f8:5e:42:9d:02:d5:86:dd SRC=fe80:0000:0000:0000:fa5e:42ff:fe9d:02d5 DST=ff02:0000:0000:0000:0000:0000:0000:0001 LEN=120 TC=0 HOPLIMIT=255 FLOWLBL=377250 PROTO=ICMPv6 TYPE=134 CODE=0 MARK=0x3214
[ 69.253722] [UFW BLOCK] IN=eth0 OUT= MAC=a8:a1:59:46:c5:f2:f8:5e:42:9d:02:d5:08:00 SRC=64.59.184.17 DST=10.0.0.101 LEN=140 TOS=0x00 PREC=0x00 TTL=61 ID=2939 PROTO=UDP SPT=53 DPT=47000 LEN=120 MARK=0x3214
[ 76.818689] [UFW BLOCK] IN=eth0 OUT= MAC=33:33:00:00:00:01:f8:5e:42:9d:02:d5:86:dd SRC=fe80:0000:0000:0000:fa5e:42ff:fe9d:02d5 DST=ff02:0000:0000:0000:0000:0000:0000:0001 LEN=120 TC=0 HOPLIMIT=255 FLOWLBL=377250 PROTO=ICMPv6 TYPE=134 CODE=0 MARK=0x3214
[ 88.865910] [UFW BLOCK] IN=eth0 OUT= MAC=a8:a1:59:46:c5:f2:f8:5e:42:9d:02:d5:08:00 SRC=64.59.184.17 DST=10.0.0.101 LEN=103 TOS=0x00 PREC=0x00 TTL=61 ID=11429 PROTO=UDP SPT=53 DPT=32800 LEN=83 MARK=0x3214
[ 97.834482] [UFW BLOCK] IN=eth0 OUT= MAC=33:33:00:00:00:01:f8:5e:42:9d:02:d5:86:dd SRC=fe80:0000:0000:0000:fa5e:42ff:fe9d:02d5 DST=ff02:0000:0000:0000:0000:0000:0000:0001 LEN=120 TC=0 HOPLIMIT=255 FLOWLBL=377250 PROTO=ICMPv6 TYPE=134 CODE=0 MARK=0x3214
[ 108.904481] [UFW BLOCK] IN=eth0 OUT= MAC=a8:a1:59:46:c5:f2:f8:5e:42:9d:02:d5:08:00 SRC=9.9.9.9 DST=10.0.0.101 LEN=140 TOS=0x00 PREC=0x00 TTL=60 ID=40859 PROTO=UDP SPT=53 DPT=36463 LEN=120 MARK=0x3214
[ 115.852661] [UFW BLOCK] IN=eth0 OUT= MAC=33:33:00:00:00:01:f8:5e:42:9d:02:d5:86:dd SRC=fe80:0000:0000:0000:fa5e:42ff:fe9d:02d5 DST=ff02:0000:0000:0000:0000:0000:0000:0001 LEN=120 TC=0 HOPLIMIT=255 FLOWLBL=377250 PROTO=ICMPv6 TYPE=134 CODE=0 MARK=0x3214