Background gets blackout after using Effects like Shaky,Wave, Liquid etc

Hello,

I am trying to use the effects like shaky on Sprites and Wave which I guess are heavy process. When I apply this on the sprites they work properly but after If I pause my game and then resume.

Background becomes black and I can not see my bg anymore

Why is this happening I really have no idea ? It happens only when I use these effects

Is there anything I need to take care of after applying this effects on the sprite.

I am not sure is it android bug or my mistake ?

Please reply

Thanks