accessibility service being off automatically

Hi,

I am using OP3 from last 1 month. Some app required accessibility service to be on, I observed that accessibility service being off automatically. Like applock, voodoo, freecharge, 360 security. Because of this applocks fingerprint is not working

Also sleep(turn of display) sometimes not worked

Any other faces this issue??
What is the problem? Can someone help me to solve this.
Phone is not rooted.

Thanks in advanced