I’m able to resolve the issue by power cycling the device. It lasts for a day or two then comes back out of the blue randomly.
The difference between my hot phone and my cool phone earlier was ONLY the Apple update. Not sure what your point is. It’s clearly a problem with the update.
To give an example analogy, say you have a leaky kitchen sink. Maybe you bought a defective part or something. Who knows. But the restore and rebuild approach is akin to demoing the whole kitchen and rebuilding instead of just fixing the sink. It’s dumb. The problem is, Apple will actually give that to people as a “solution” when it is clearly their job to fix the leaky sink (to continue the analogy).
A lot of people don’t have time to spend hours and hours messing with their phones that they spent upwards of $1200 for after a minor update either. One of the major selling points of a platform that is twice as much as the competition is how well it’s supposed to work without the fuss.