well, you could try reinstalling and updating your drivers for your hardware. if that doesn't help - see if your router has issues. check the provider/check your routers connectability, mine for example lets me go to a website that shows me if i had any dcs or if my connection was unstable at some point. i don't know your hardware and the situation you live in. are the cables alright? is the cable you use broken?
i don't think that this is the issue, i trust you know your stuff. try it with reinstalling first and check this
https://www.howtogeek.com/174068/how-to-identify-which-hardware-component-is-failing-in-your-computer/
i hope you find out what's wrong, mate