The clutch pedal in my 98 Legacy GT loses pressure in really hot weather to the point where the pedal doesn't return to its normal position. I've had the slave cyclinder replaced but this didn't fix the problem. The clutch works fine in normal temperatures. Has anyone had this problem? My dealership says they've seen this a couple of times this year but are having trouble diagnosing the problem. The car has 123,000kms on it.