Game Crashing and Stoping self after play 7-10 mins

Hi devs, We have a puzzle Game.Game crashing and stopping self after play 7 min advance mode(advance mode hase more words in game like 50-80).Some lowest (mean old phones) android devices stopping game while playing.We test the game with Unity Profiler and Frame debugger.We couldn't see anything wrong something on Analysis.

I'm gonna share some analysis with graphics.if you can see anything wrong please let me help for fix.
When any word didn't found

After I found all words

And Graphics
When I found words in succession.

And my game view

need help