Morning people... I have an disturbing question i want to get out of me.. My phone is Stock.

Since 2 days ago, my battery has been draining very much in Airplane mode... for 2 nights, i slept with 100% and wake up next morning to find it depleted to 85% in 7 hours! I checked and phone idle = 57%. Previously, the phone can only deplete to 95%.


Anyone has this problem OR any idea on what might be causing this? Would appreciate any advice..