Phone clearly having problems- unable to find what

My phone (OnePlus 7t) has been having issues lately, and I'm unable to find out what's wrong; apps have been randomly crashing, either instantly or after like half a minute, and it's just generally been far slower, and google sign in takes a fair bit longer to kick in.

Apps crashing: Boost for Reddit (works ONCE before I have to redownload) Reddit is Fun (same as Boost) Genshin Impact (loads, then crashes... File integrity check comes up w/nothing) A couple others, but not reliably

Things tried: Phone restart Uninstalling/reinstalling Downloading Avast to scan (nothing found) Looking it up on Google (Which proved unhelpful; just said it may be up to signal but that cannot be it)

What else should I try? Anyone know what's up?

Update: RiF was tried and literally doesn't even open after the first time it opens; Reddit itself also takes forever to load but works more or less fine after that; whatever the issue is, it really doesn't like Reddit I guess?

EDIT: it seems to be an Android Webview issue! I tried to uninstall updates for it and things immediately got better! I'll still leave it open for a short bit for any other remarks, but not too long.