Hey there @Cityofclouds, I hope you're doing well.
I'm sorry to hear that your device isn't behaving as it should. Can you please provide me with your current baseband version? You can find it in: Settings >About phone >Software information.
I'll try to replace the issue on my device as well.
Hey @Cityofclouds, I tested this exact scenario on my personal device and couldn't replicate it. I am on a newer software version than you are so this may already be fixed in an upcoming update that you should receive in the near future. I'll give it another shot tonight to see if my device does this.
In the meantime, you could try to wipe your devices system cache partition to see if this helps. To wipe the system cache, you'll need to do the following:
I hope this helps. I'll report my experience again tomorrow.
I did a partition wipe yesterday. I woke up and it had switched back to automatic time zone during the night again. I have the phone doing an automatic restart once a week. It seems to be switching from manual time zone to automatic time zone during the night every day.