AC Low Pressure Switch keeps failing

[falconut]

Maybe somebody here can give me some areas to look into. My son now drives my 2007 base PT, but only really uses it as a back and forth vehicle, so not a lot of mileage. A couple weeks ago the AC just stopped. The compressor wasn't turning on. I replaced the low pressure switch and it started working again, I also checked the charge and it was around 40psi, so in the range.

About a week later he drive the car (1st time since replacing switch) and drove about 30 miles & it worked fine. On the way home it stopped almost immediately. I exchanged the switch for a new one and it worked fine again.

A couple days later he drove it again and this time it stopped almost immediately after turning it on. Any ideas as to what could be casing the switch to fail? I doubt I got 2 defective switches. Any help would be appreciated.

[falconut]

I'm guessing this isn't a common occurrence.