Connection keeps dropping randomly multiple times a day, but only on one specific device
I am pretty desperate as my VR300 router does my headache each and every day by randomly disconnecting from internet. Weirdly enough only one device (the most important in the network) suffers such problems.
My network consists of several wireless devices including laptop and mobile phones and a main desktop computer that is connected via TP-Link AV600 Powerlink and wireless usb dongle as a backup.
The problem: Desktop PC keeps dropping internet connection when browsing internet and watching YT videos (often multiple times during a longer clip).
Tried solutions & observations:
1.) made sure firmware is up to date on all hardware
2.) when wired connection drops, I tried to check the wireless connection to the same device and it could not connect as well, so problem seems not to be in the powerlines.
3.) weirdly enough, when I check the other devices connected to the same network - they are always connected without problem, so it is not that router will not have connection. It simply only drops it for the desktop.
4.) Checked my adapter settings and tried to change the DHCP to static IP hoping that this might resolve the problem. Went to router settings and set up and reserved static IP for each device seperately. However, problem persists and adapter settings keeps changing automatically for some reasons when manual IP is set up in Windows 10 adapter settings. Default gateway IP tends to disappear from the settings despite being manually selected and saved. The common error given is that DHCP is not enabled, so internet could not be estabilished. But why would I get this error when I set static IPs, I have really no idea. Also IPv6 protocol keeps re-enabling itself despite I've swtiched it off in Windows manually (my VPN does not like it)
So I am really out of options, don't really know why is it that only one device gets primed for disconnects on both wired and wireless at random. Often, the icon on the taskbar showing wired connection does not even change to offline version and keeps telling me that internet is connected, but no website can be reached.
Disconnects range usually from under 30secs up to several minutes sometimes, which is extra annoying and there is no way telling when they will happen next.
It would be really great if anyone could help me understand and resolve this problem as I searched internet and forums a lot without any luck.