Another Volvo that won't start

Just wanted to thank this site and the above comments. My 2004 Volvo XC70 had this “won’t start” problem but it didn’t happen alot. Then it happened 3 days in a row. Took it to dealership for the fuel pump recall and bought the relay while I was there. It wouldn’t start when they went to move the car to the washing area, I handed them the relay, it started. After the car wash it wouldn’t start again! I said “clean the wire to the starter” and they did and I haven’t had a problem since.
They fixed it for free… but they said they had never heard of this problem which I find hard to believe.
Thanks! I love my car again!