I had the same: no new apps, but it started as soon as I enabled the "battery charge booster" in ES File Explorer.
I don't mind paying for ES FileExplorer, but if I can't get an Ad Free version from E Strongs, I'm going to have to find alternatives as they're just wasting resources and screen...
Does Aquamail allow "Exchange" server access via OWA scraping? Not the most battery-efficient, but it does work and it's the only way we can get work e-mail on Android devices.