Even for me gmail was crashedI have wipe out the cache then it was working fine.But after update battery was draining.In 5.1 it battery was around 11 to 12 hrsNow it is 8 hrs

For me Mobile csc is singapore and csc was change to india by some shopSo it was not happenedAfter that i have revert back to Singapore.Then it was working.But in yours csc is normal no changes happen.So it should come automatically

Thanks broI have changed it to Singapore then immediately i got the update

How to fins the csc is mismatch.

I have not changed .I bought used phone form one shop