As I've mentioned my signal is really strange,varying from 2% to 27% to 100% very often.
The wifi is close to me
00:00.0 Host bridge: Intel Corporation Xeon E3-1200 v6/7th Gen Core Processor Host Bridge/DRAM Registers (rev 05)
Subsystem: Gigabyte Technology Co., Ltd Device 5000
Kernel driver in use: skl_uncore
00:01.0 PCI bridge: Intel Corporation 6th-10th Gen Core Processor PCIe Controller (x16) (rev 05)
Kernel driver in use: pcieport
00:14.0 USB controller: Intel Corporation 100 Series/C230 Series Chipset Family USB 3.0 xHCI Controller (rev 31)
Subsystem: Gigabyte Technology Co., Ltd Device 5007
Kernel driver in use: xhci_hcd
Kernel modules: xhci_pci
00:16.0 Communication controller: Intel Corporation 100 Series/C230 Series Chipset Family MEI Controller #1 (rev 31)
Subsystem: Gigabyte Technology Co., Ltd Device 1c3a
Kernel driver in use: mei_me
Kernel modules: mei_me
00:17.0 SATA controller: Intel Corporation Q170/Q150/B150/H170/H110/Z170/CM236 Chipset SATA Controller [AHCI Mode] (rev 31)
Subsystem: Gigabyte Technology Co., Ltd Device b005
Kernel driver in use: ahci
00:1c.0 PCI bridge: Intel Corporation 100 Series/C230 Series Chipset Family PCI Express Root Port #5 (rev f1)
Kernel driver in use: pcieport
00:1c.5 PCI bridge: Intel Corporation 100 Series/C230 Series Chipset Family PCI Express Root Port #6 (rev f1)
Kernel driver in use: pcieport
00:1c.6 PCI bridge: Intel Corporation 100 Series/C230 Series Chipset Family PCI Express Root Port #7 (rev f1)
Kernel driver in use: pcieport
00:1c.7 PCI bridge: Intel Corporation 100 Series/C230 Series Chipset Family PCI Express Root Port #8 (rev f1)
Kernel driver in use: pcieport
00:1d.0 PCI bridge: Intel Corporation 100 Series/C230 Series Chipset Family PCI Express Root Port #9 (rev f1)
Kernel driver in use: pcieport
00:1d.1 PCI bridge: Intel Corporation 100 Series/C230 Series Chipset Family PCI Express Root Port #10 (rev f1)
Kernel driver in use: pcieport
00:1f.0 ISA bridge: Intel Corporation H110 Chipset LPC/eSPI Controller (rev 31)
Subsystem: Gigabyte Technology Co., Ltd Device 5001
00:1f.2 Memory controller: Intel Corporation 100 Series/C230 Series Chipset Family Power Management Controller (rev 31)
Subsystem: Gigabyte Technology Co., Ltd Device 5001
00:1f.3 Audio device: Intel Corporation 100 Series/C230 Series Chipset Family HD Audio Controller (rev 31)
Subsystem: Gigabyte Technology Co., Ltd Device a182
Kernel driver in use: snd_hda_intel
Kernel modules: snd_hda_intel
00:1f.4 SMBus: Intel Corporation 100 Series/C230 Series Chipset Family SMBus (rev 31)
Subsystem: Gigabyte Technology Co., Ltd Device 5001
Kernel driver in use: i801_smbus
Kernel modules: i2c_i801
01:00.0 VGA compatible controller: NVIDIA Corporation GP108 [GeForce GT 1030] (rev a1)
Subsystem: Gigabyte Technology Co., Ltd Device 375c
Kernel driver in use: nouveau
Kernel modules: nouveau
01:00.1 Audio device: NVIDIA Corporation GP108 High Definition Audio Controller (rev a1)
Subsystem: Gigabyte Technology Co., Ltd Device 375c
Kernel driver in use: snd_hda_intel
Kernel modules: snd_hda_intel
02:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 0c)
Subsystem: Gigabyte Technology Co., Ltd Onboard Ethernet
Kernel driver in use: r8169
Kernel modules: r8169
my lspci -k output
IN-USE BSSID SSID MODE CHAN RATE SIGNAL BARS SECURITY
* BBSID SSID Infra 5 16 Mbit/s 69 ▂▄▆_ WPA2
BBSID Infra 1 16 Mbit/s 0 ____ --
-- Infra 1 16 Mbit/s 0 ____ WPA2
-- Infra 1 16 Mbit/s 0 ____ WPA1 WPA2
Infra 2 44 Mbit/s 0 ____ WPA2
Infra 5 44 Mbit/s 0 ____ WPA2
Infra 5 44 Mbit/s 0 ____ WPA1 WPA2
Infra 13 16 Mbit/s 0 ____ WPA1 WPA2
nmcli device wifi list