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Galaxy S4 keeps lagging/pausing for about 10 seconds
Stock Galaxy S4, running Android 4.4.2, no custom launcher.
I've been noticing a problem that seems like it's been around for a while (some months at least), but seems to have gotten quite a bit worse recently. Up until today I only noticed it while playing a certain game (Scramble With Friends), so I assumed it was a problem with the game and just lived with it, but today I noticed it outside of the game, unless it's a separate issue. The problem is that the phone periodically just stops responding to touches and button inputs for about 10 seconds, maybe a little less. Even if I press the power button to try and turn the screen off, that won't even respond for a few to several seconds when this is happening, and when the screen does finally turn off, the navigation buttons on the front bottom of the phone stay lit up for a short bit after the screen goes dark, when normally those buttons turn off at the same time as the screen if I turn the power off.
It seems like it's happening once every few to several minutes now. I don't know if it's something in the OS or Touchwiz that's causing it or if it's a 3rd party app that's running in the background causing it. I'm not an app fiend, but I have enough (perhaps 40-50 including games, but not including all of the bloatware etc. that gets installed automatically) that I wouldn't want to uninstall them one by one to try and find the culprit unless I had no other choice. I'm hoping perhaps somebody out there is familiar with the problem, or if not, perhaps knows of a utility that might shed some light on what's happening. I have no "active apps" according to the OS, but certainly there are a bunch of apps on the phone that are using data in the background and performing who knows what functions. Any useful suggestions aside from just uninstalling apps appreciated, thanks.