Screen Black when scrolling FB
 

When I'm using FB (going up and down on my FB) on my Android smartphone, a half of screen suddenly become black and it remains for a several seconds and get back to normal..Does anybody know why this happens?

Two likely reasons which come to mind would be - slow processor on the smartphone, and low RAM (memory), so incoming new content when scrolling, first has to load into memory while the non-showing content has to unload to make space. If that makes sense.

Thanks for reply..You were right..After clearing some old stuff, it started to work fine