Why won't accessibility services stay on for certain Apps?

[AC Question]

Accessibility services won't stay on for Tasker and a few other apps. I have to go back and turn it on periodically. It stays on for certain ones such as Apex Launcher.

Any ideas?

 

[anselm94]

Accessibility services are generally not killed by the system or any app. I've noticed this too in my app (Torchie) in some phones only. Mostly when the system goes to deep sleep and do not start the service when woke back.
The memory (RAM) size plays a factor?
[EDIT] The Accessibility Service does crash anytime, without users knowledge. In such case, you have to go back and restart your phone/accessibility service