one minute, it worked; the next—zip. we have a 30" bosch gas range/oven that we bought in 2007. so far, it's been great. friday, however, i went to roast some mirepoix for stock and the oven was still cold after "preheating" for 30 mins. i checked the broiler—nothing. the range still works, but you can't even manually ignite the broiler or oven. any suggestions?