Manufacturing flaw with Final Stage Resistor?

[vegasX5]

I am curious if you think this could be either bad luck or a serious manufacturing flaw with the final stage resistor in the climate control. I need to replace mine for the the 3rd time in 6 years...

Here's the funny and very peculiar part though. I kept a journal of the repairs I've done to the X5 and when the parts failed or problems started. The FSR has failed every two years literally almost to the day, and in the same time of day!! Check this out

FSR failure #1 July 25, 2006 - 10:15pm
FSR failure #2 July 11, 2008 - 10:50pm
FSR failure #3 July 12, 2010 - 11:20pm

Every single time it's been after 10pm and within 1-2 weeks of it's 2 year mark. I know specifically because it's happened each time when I'm getting back into the X5 after I'm leaving the gym! I honestly laughed about it last night because I was thinking it would fail at any time after a workout. I wasn't laughing this morning when I forgot I had no AC and had a wrinkled suit by the time I got into work (it's about 110 degrees today).

So do I have bad/odd luck? Is it a result of the extreme temperatures here in July? Or is it a serious flaw with the part?

FWIW - the local dealer wants $169 for the part I'll be ordering it from Autohaus AZ for $70 and free shipping - if I can wait a coule of days..