Cheers lads.

I gave the ISCV a good clean today and thought I'd cracked it but after 20 mins of trouble free driving I got stuck in traffic and it did it again.

Is there any way of testing the ISCV to see if its fooked or not?? Anyone know how much a new one is?

Or what else could it be?? Could heat be a factor when stuck in traffic? (water temp normal)