The extreme temperature swings in the attic were what did it.

Yeah, I was planning to put some servers out of the way in my attic, but decided I would check the temperatures first. During the summer last year I put a min/max thermometer up there for a couple of weeks.

The weather was average British summer weather, i.e. not particularly hot.

The temperatures measured varied between 10 and 45 degrees C. Needless to say I have changed my mind on putting the servers up there.
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Remind me to change my signature to something more interesting someday