Why do services kill themselves?

[AC Question]

Hi everybody. I've got a Huawei Y635-L02 Running android 4.4. I recently started using the Nova Launcher because it makes it look nicer. On that topic, I downloaded Hi-Locker and Material Status bar. They look really good, however, they require me to tick "Services" in Settings > Accessibility. Fine by me, however every five minutes they de-activate themselves, meaning I have no lock screen or top bar. Can anyone help?