G3 Restarts for no reason after the Lollipop update. topic

Been Using G3 for the past 5 months. Faced tonnes of issues with over heating, restarting, etc.
But I thought all would be resolved with the Lollipop update.
Unfortunately, that's not the case here. I just updated to Lollipop last night and faced 3 inappropriate restarts in less than 24 hrs.

Any Suggestions or remedial measure is welcome guys. Using a stock and Unrooted device for now.