Force 300-16 case cracking after 3-4 years

Hi Guys, I have these 2 units, 2 different clients, force 300-16 which cases are cracking after 3 years in the field? exactly 3 years an 5 months one and 4 years the other one. has anyone had the same issues?, I just want to ask before opening a ticket in case it’s been just my bad luck. We realised about the cracks cause the units became faulty after heavy rain.