Lenovo — mobile is not working properly and heating also

Address:

Thane, Maharashtra, 400604

Yesterday i update mobile system from system update. But from yesterday, it is not properly working. When i operate mobile it give me so many time "unfortunately, the process com. Android. Phone has stopped" this statement and it gives me two option below the statement "ok" and "try to solve". I tried both options, i restarted also. And if i click on any option my sim card network is going off. So this is major problem.

And it is heating so much.