Have the same problem as Argie, Mighty Thor, Disenchanted Bosch users, and Andy B - now on third unexplained break of lamp cover on BOSCH U1722 top oven when in use! Main part drops into food leaving thread in place. I am very careful not to overtighten it so I can easily get the thread ou though. Last letter from Bosch said "“Causes can include foodstuffs on the surface of the glass causing one area of the glass to “super-heat”and the resulting temperature difference across the surface of the glass can cause the glass to break”.
Surely in an oven/grill, food splashes should be normal and catered for in effective design? Really fed up with Bosch! Strange thing is, these lamp covers feel really chunky!
Steve W
April 2011