Baked lightmaps and Admob ads plugin don't work together. Any help welcome.

During the month I struggle the frustrating problem with Unity 2018.4.14f1 LTS on Android platform:
Issue: When i load scene with baked lightmaps and this game build has Admob plugin, it kills FPS dramatically. I mean the game becomes unplayable, it shows 1 frame per ~4 secs.

- When i load same scene with no baked lightmaps - everything runs smoothly.
- When you don't have admob plugin in the build, the same scene with baked lights works smoothly.


Does anyone has the same problem? Or something similiar? Now i'm making tests to solve this problem and any help would be welcome. I have plans to make a bug report but i'm new to it, so it would take some time.

This problem is quite upsetting because it deals with the released project and dev process has stopped because of it