Possible bad control board
You have a problem that no one else has encountered. I would use the convection feature all the time as it keeps a much more even heat. Could it be that convection starts when the oven reaches temperature.? A model number would be useful in questions like this to find a manual.
https://www.google.com/search?q=Viking+gas+oven+and+recently+while+on+bake+it+automatically+turns+to+convection
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