I can agree with what's been said above, I too heard the rumours about relays burning out and sticking on.
The other thing I heard of people replacing as a preventative measure was the 40 amp fuse.
Firstly let me say if a fuse is not blown there is no need to replace it.
As to the relay, in my case the compressor was good and even though I replaced the relay the old one had no arcing damage to the contacts but that's not to say yours is not.
Things like a a worn compressor or leaking struts can make the compressor run on overheating it and possibly damaging the relay too.
So my advice would be what has been mentioned already by Neil, get Vcds and check the compressor, keep an eye on strut levels if you haven't used the car for a week, if it's dropped a bit on one corner that's a indicator of a leak somewhere which if left unchecked can cause compressor wear and flat battery's as the car wakes up peroically and tries to maintain a level stance.
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