Mine has been doing this recently. I got frustrated after trying everything and finally just flicked the speaker on my phone really hard and it came back on. Maybe it is faulty connections with the speaker itself. Perhaps the phones should have been recalled.
I Know what the problem is, I had same issue no sound will not ring ect. I noticed no problems after cleaning my screen using lens cleaner works every time for me.
I was facing same issue. don't know it is permanent solution or not but I did I am sharing here.
1. Try to call someone and put you speaker on, do same until your phone comes up on speaker.:unhappysweat: :unhappysweat: :angry::angry: