I helped this guy work this out.
The 180-degree “rule” isn’t a rule, it’s a convention. The problem with it is that you end up with overly sharp backgrounds that take too long for the processor in the camera to process.
It’s not luck, a few cameras have the same problem. Some don’t.
You might find dropping the shooting mode down to 1080p will fix the problem and setting the ‘shutter speed’ to something higher.
Edit - Here’s a diagram that might help:
