I've upgraded my Note 3 Pro from 6.6.17 to 6.6.18 to fix freeze when cleaning memory (dirty flash) and phone started to overheat, battery's also drained very fast, while on 6.6.17 it achieved 9h SOT. Similar thing happened with my girlfriend's Redmi 3 Pro, updated from 6.5.26 to 6.6.18. Is it...