Im using s21 ultra for a year ..and now i found that my back glass or cover is losing its stickiness..Same as when i was using s10 plus...Why this thing is happening...and with the flagship phone which cost a lakh or some more....

Im using s21 ultra..

Hi....im using samsung s21 ultra exynos version.And when i play call of duty mobile on it ..it gets hot and and fps of the game drops ..even though the device has 120hz display...And even then the game becomes choppy..And i play the game at minimum g...