It's around couple months that only on the Card Collection page the screen sometimes blinks in brighter to darker and not always and is too annoying but by a little vertical sliding downward it becomes normal.

Another bug that happend around 1 month and I think mostly in 2v2 battles that the screen gets heavy pauses(stuck or glitch) without icon of poor internet connectivity, and then sometimes gets slow or gets back to normal or even recently the clash royal game closes and backs to homescreen! But with all kinds of reactions after a heavy glitch a strange notification alarm comes up in notification area with green Android icon that has no text message(empty)!

None of these bugs happened in any other app or game on my device and I carefully checked this.