Gravity Sensor test fail

[PSPVinyls]

I've had this problem once before and I used to be able to fix it by banging my phone on my hand twice. Now it keeps on happening and the only way to fix it is to restart my phone. I would be watching something on YouTube or reading something on a website holding my phone horizontally and then every so often it would try to rotate the screen back to portrait mode. Also my phone has been giving me problems waking up after I hit the power button. When the screen is off and I press the power button it doesn't always go to the lock screen. I give it a few seconds, press it again, nothing happens. I can press the 3 buttons on the screen even though they aren't lit and can feel the vibration like normal. Has anyone else experienced this before?

 

[PSPVinyls]

Here's what the test looks like after I restarted my phone.