On my old phone I had an issue with the proximity sensor and front facing camera. This led me to holding my phone backwards to take photos and being unable to hang up phone calls.
I think I put up with this for a year and a half.
I did end up figuring out the issue with the proximity sensor but opening up my phone to reconnect the camera module was too much effort for me.
None. I’m an engineer, if there’s a technical issue, I just can’t ignore it. I have to fix it, or get it fixed, or implement a workaround or switch to an alternative.
My luck with phones has always been pretty good, never had any major issues with any of them, going all the way back to the dumbphone era. Only exception ever was a Note 8 that I’d dropped on concrete only a few days after I bought it, but instead of fixing it, I decided to just sell it off the very next day, and switch to some other phone (kinda hated the Note 8). But otherwise, never had issues with phones - even second hand ones bought off eBay. I even bought phones from Kickstarter, like the Nextbit Robin and the Unihertz Jelly, never had issues with them either.
Same with technology in general. Never had any major issues with latops, PCs, consoles etc, going all the way back to my 486 DX2 in the MSDOS era. At least, there was never anything that I couldn’t fix myself.