2000 Grand Prix blower resistor keeps going bad

I have replaced this resistor twice this year. The last one only lasted 2 weeks, and the one before 2 months. This has manual temperature control.

Does anyone have any ideas on what may be causing these to go bad prematurely? Could it be the blower motor even though it runs alright and has no unusual noises or the blower motor switch?
Any thoughts would be appreciated.