Dave, my last Golf (2000 1.8t GTi) used to blow them quite often (not once a week though), but it was annoyingly often. A mate once spotted me and called me on the mobile to say both my rears were out and I only had the high level break light! I always went to the VW dealer to get new ones, but they still blew. My 2003 Golf hasn't blown any yet, I've had it from brand new and its on 34000 miles now! Sorry I can't help, but at least your not the only one with lights popping on a Mk4.