Are you using a wireless adapter? I had that problem once with the helper software that came with it. Uninstalling that and installing some third party wifi managing utilities solved it.
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PSA: If you have been having stutter/FPS lag on Disco where it does not run as smoothly as other games, please look at the fix here: https://discoverygc.com/forums/showthrea...pid2306502
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Take a look at everything you've downloaded/installed since the problem started. That'll probably get you somewhere. Most of the time when your computer is doing something like this it's a program popping up with a notification, most like an anti virus or windows update. Try having a look for any of those when it happens.
I had a similar problem couple of years ago and after some reding i found out there was a virus ( i do not remember its name) and i made it go away by making a complete scan with nod32 and if that wont work just make a clean windows install since most viruses tends to infect rundll32 or other system vital proceses.