My phone's recent apps and back buttons stop functioning. Eventually they came back on and only the recent apps button worked. After a while the phone was on the charger one night and when i turned it on, it was saying dm-verity verification failed/need to check drk first. Now the phone is completely dead when charging or not, the phone has no led indicators or anything. I have noticed that when plugged in the battery unusually heats up. Could it be a battery problem?