Screen rotation problem

The process in charge of reading the accelerometer may be having troubles. I suggest you hold on your power/suspend button for 5 secs and then completely turn off your iPhone. After the phone has been turned off, press the power button again to start it (this will perform a "cold boot" of the phone). That's the equivalent of completely powering off a computer.

If the problem persists after the reboot, then you might have to restore your phone from a backup using iTunes.

Please provide more information or use the search tool in the upper right corner of the website to find similar answers on how to restore an iPhone from a Backup.

So here's what happened:

I took the computer to the AppleStore, seeing it was only about three weeks old, and got them to take a look at it. Since it's a company computer I had some company benefits granting me a temporary replacement while they were fixing mine. I took my TimeMachine copy and restored it on to the borrowed Mac. I was surprised to find that the issue still appeared, which was quite annoying. So I restored the Mac again, messed around with the pmsetsettings and tried to reproduce the issue but it was impossible.

I then remembered that the issue started appearing a few days ago when I did a battery calibration (Drained the Mac completely) so I restored to a TimeMachine backup from before that and Boom, the issue was gone. At about the same time they called from the store and said that they couldn't reproduce the issue, so I told them what I had found, came in and got my computer back.

All in all, a really weird story but apparently something related to draining the battery while the computer was still on got corrupted and was then included in the TimeMachine backup.