Why does my Facebook keep logging me out? Anyone else experiencing this?

Thanks for all the suggestions, everyone! I tried clearing my browser cookies and switching to Facebook Lite, and it seems to be working better now.

But I’m still curious—why does my Facebook keep logging me out on the main app? Is it really just a bug, or is there something else going on?

Also, has anyone tried contacting Facebook support? Did they give you any useful info? Let me know!