Ouch, so you were unfortunate enough to get update 2004 installed. That might be what's causing the issues. Luckily for me, Windows decided to skip that version for now. It has been showing the update for several weeks, but won't install it. Instead, I keep getting 1903 updates. Got some last night, so I assume Microsoft might not have 2004 fixed just yet. I read somewhere that they had it rushed out, and it ended badly, being recalled the next day. My PC wasn't scheduled for updates when this happened, so I was lucky.
Microsoft has been migrating to a different kind of network that seems to be incompatible with Win7. You might have noticed they have removed "HomeGroup", so things now work differently in Win10. I am not sure how incompatible this is with Win7, since I haven't used it for years now, but judging by what you said, it might be incompatible. I am not even sure if Win7 is still supported, so they might not care for compatibility at this point.