It sounds the same thing as with my Bosch SGS5302. I haven't taken it out and looked yet but from what I've read across the interweb it is more than likely a bad track on the PCB. It's easily repairable but Bosch certified repairers won't do it, they'll tell you to replace the whole PCB at big cost. Do a search here and via Google for more info.
bridget, June 2009