Hi I am extremely sad to know that after April update, M31 users are getting trouble to use phone. But I am happy to express my Review that after successfullly updating today morning, I noticed that some time Battery draining is fast. But in the evening I just plugged in Charging for 1 hour (just 48%). And I am using this set and I have not yet faced any trouble. I am perplexed that other M31 users are facing problem.