Facebook sometimes locks in to length display.

[BK2HEAT]

I've noticed that sometimes I open Facebook on my phone, and regardless of  how my phone is positioned, it switches to lengthwise display and locks in. I can't rotate the phone and get it to switch back. I have to power off and on my phone. Does anyone else have this problem and/or know of a fix?

[mama23dogs]

It sounds like a defect if the gyro that tells the phone which way is up.   My iPad occasionally does the same thing and I fix the same way.