I noticed it when I went to use SMS and the screen immediately switched to landscape and would not rotate back when I held the phone upright. I unchecked the auto rotate in the settings and it returned to upright. I also noticed at the same time that the screen was a little dark and was not auto adjusting the brightness.
From the phone I entered *#0*# to get the test page and on opening the sensors they where all stuck solid. Only the proximity would work.
Sensor Hub test shows the STM32 pass.
The only way to fix it is to power off and back on. A re-start does not fix the issue.
I suspect a hardware problem. Anyone else seen this before?