I just replaced this PSU a month ago and I lost one of the secrws that connected it with the hashboards and tried to find a titanium screw in local shops and find nothing, and I took one of the screws from a house machine and it works fine for around a month now. I upload a photo if you didn't get my point.
As long as the screw is tight enough and the connection isn't loose - there shouldn't be a problem, I highly doubt that reason alone is what killed the PSU, what is your input AC voltage?
Also just check the screw its too long as its going through and possibly touching components.
good point.
I must ask does the room run hot?
35C or 90f or higher.
is the gear clocked high speed vs medium speed.
I have s17pros they like medium or low when it is really hot.
Maybe you have it on high in a hot room.
Maybe you have 205 or 208 volts vs 220-240
if volts sag lower it kills psu's
It's a 220v and yes I used long screws long time ago and it's will take less than a minute to change the screws colour because of heat for the AC voltage am living in Kuwait so 220v is the standard and I followed mikey post about his room step by step so I have a cold and hot rooms the temperature in the cold room runs around 24-28C and for the devices setting its all runs on normal no over clocks at all.
The spare parts arrived today I'll replace the power supply and make sure to send the old one for testing.