What about installing some antivirus than can scan on demand?

I don’t know how’s the “market” right now, but a few years ago Malwarebytes was good for Windows, and ClamAV in Linux

I’ve also read another of someone with connection issues with their server. Server was unreachable, but every time someone went into the server room to debug the problem everything was working fine. After a while they noticed the switch with all the cables was plugged to the same outlet as the lightbulb, an outlet which was motion activated, so it only worked while someone was in there.