I've found that the only way that I can keep App Lock working reliably on my Android phone is by turning off battery optimization for Bitdefender Mobile. If I don't do this then I have to reboot the phone, after which App Lock will work for a short while and then quietly quit. By "quit" I mean that no apps are locked.
I found this solution after a little Googling, so it's a known problem.
Does anyone know of a work-around that will let me have battery optimization without losing App Lock ?
Does anyone know if BD is actively trying to fix this problem ?