Windows 10 High ping on only one computer. Disconnects, high DPC

I have an ASUS X556UR notebook connected to a home WiFi. Everything was fine, apart from rare disconnects (computer losing router, which I thought to be signal stength/distance issue at the time).

However 2 weeks ago my internet got a lot worse. Basically now I have occasional 2-7 seconds ping in MMO games and browser, losing connection, disconnecting and losing router in the WiFi list (reappears in few seconds). Initally I thought that it's ISP fault, then router. But other notebooks and phones have no issue while my notebook does. So I realised that the problem is in my notebook.

Windows Update and Windows Defender are off.
There were no system/driver updates/configuration changes in the last 2 weeks. I literally didn't move notebook from the table.

I tried:

• Manual disconnect/reconnect to WiFi router
• Reboot
• Moving notebook closer to the router
• Updating WiFi, sound, display drivers
• Windows 10 "Network troubleshooter"
• Disc and RAM scan
• Virus scan (Kaspersky)
• WiFi adapter settings reset

What I can't try to check or use as a solution:

• Connect to the router via cable (lack of cable)

I tried to Google and found the LatencyMon program. Here are the results. I can try to collect more info if you need it.

One: ________________________________________________________________________________ - Pastebin.com
Two: ________________________________________________________________________________ - Pastebin.com