This isn’t an iPhone problem. This doesn’t happen normally. There’s one of two things going on:
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you jailbroke your phone/sideloaded/installed some shady app. Solution: hard reset that phone and set it up as new. Do not copy over anything, and use the phone as close to stock as possible for a bit. These notifications will stop. Then you add apps and stuff slowly until you figure out what is the offender.
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you’re being targeted. Somebody did something nefarious and they are probably good at it. It’s not easy to get into a stock device. I find this option possible but unlikely unless you’re a VIP or you’ve REALLY pissed off an ex lover or are married to overly attached girlfriend.
*Edit
Maybe there’s a third option. Maybe the phone’s hardware is just borked somehow - a chip or sensor or something is broke. /shrug. I suppose that’s possible too.
I’ve been a dual / triple / god knows how many OS booted since the 90’s.
Windows has gotten into bad habits lately - it’s not staying in its lane. Meaning it hasn’t respected other boot partitions for a long time, and recently there seems to be a lot of people having problems with windows nuking their linux installs.
My strong recommendation is to buy a second hard drive if you dual boot. Then windows can be “over there” - I’ve never had a problem dedicating ssds to the OS. My second recommendation is to do this now, why wait until you’re forced into something? You’ve got a year to learn Linux and get comfortable with it.