I have had my C70 in the shop 3 times now because of intermittent failures of the windows and door locks. The dealership has experienced the failure while it was in their shop, but could not determine the cause after reviewing the computer analysis. The "Tech Line" suggested they replace the Driver Door Module (DDM). The next time the "Tech Line" suggested they spray the electrical connectors with dieelectric grease. I guess they were out of Magic Fairy Dust. Now on its 3rd visit to the dealership in a few weeks, my little undependable C70 has been visited by the local Volvo Field Technician, who did another computer analysis, with no definitive results. The dealership said the "Tech Line" people and the Volvo Field Rep. did not know what to do and they are waiting for an answer from the Engineering staff in Sweden. Has anyone else experienced this problem... YET !!!