Sounds more like a blocked tube, causing a backup. Never heard of this happening on a trix, but have with other cars. I guess the XRS is a step down from the other cars you've owned, from a performance perspective, but from a reliability perspective, I think you're on the right track. The only real probs you'll soon find out with the XRS is the clutch can't stand up to the high revving shift changes and will be lucky to reach 100K with the OEM one. Then, you need to go aftermarket for sure. Check out
www.matrixowners.com for more on this subject.