I'm new to Baking Forums - here for some advice on electric ovens. My Bosch is 16 years old. It's temperature varies mercilessly - if I set the convection oven to 350degrees and leave it to preheat for 20 minutes it cycles from 385-365-345 over a period of 45 minutes. Once it gets close to 350 and stays there for a while I quickly open it, set the cake in and close it. Immediately the oven temperature drops to 320degrees then makes its way back up to 353 then drops again to 340. I did the toast test where I put 6 slices of bread on a rack in the upper third of the oven and 6 on a rack in the lower third. After ten minutes the toast on the upper rack was golden. The bread on the lower rack was not toasted on top and burnt on the bottom. Clearly my convection isn''t convecting. I know these are two separate problems - my question is have others had this variable temperate experience? How do you deal with it? I've been to a couple of appliance stores who say that new electric ovens behave similarly to this. Also they're no longer built to last more than ten years unless you spend upwards of $10,000 for a Wolf. They all said the Bosch continues to be the best in class above Kitchen Aid, GE Cafe, LG, etc. Help!