This sounds a lot like the problem Android had with background tasks. Starting in KitKat, a batching mechanism was introduced, so that apps which declared that

This sounds a lot like the problem Android had with background tasks. Starting in KitKat, a batching mechanism was introduced, so that apps which declared that they wanted CPU or screen resources in the future didn't all have separate timers running, but instead became members of a class that wanted similar things. One of the most effective features of Greenify, a battery-saving app, is to force all apps (or all apps minus a few that you designate) into the batching mechanism.