Android Build Black Screen


We are facing a problem with our android build. When I start the game from the beginning game runs well and renders everything fine. after playing for a while, If we close the game and restart it from Some check point, the does not render most of the assets. Just black screen even the skybox is also black. We are unable to figure out the reason. Can we get some help on this?
We tested on Redmi K20 pro and Samesung S10es.

Thank you