Split doorbell button

My ring video doorbell is a couple of years old but the button has split. It does not have excessive use so wondered if this is a common failure and how I might get it fixed. It still works, looks like not for much longer.

I have exactly the same problem and have worked out it is because it must be in direct sunlight so, the button sleeve/cover is not good enough for the sun. The remedy - either move my front door or, buy some kind of cover of the top to prevent the sunlight !!! (In short, there is no solution to this problem)
I have - as yet - to learn how to turn off the sun !!!