For those using these ovens, do you guys have a high failure rate on them? It always seems ours has something wrong it. We are getting ready to install our second tempature control panel, in 4 years. Not to mention the other 100 things we have had to replace/fix on it. Our tech said the cooling fan was clogged most likely from flour and stopped working, which in turn overheated the tempature control unit. You would think there would be better fault protection on these things, or better cooling for the electronic components.