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If the temperature won't hold on bake but does on convection, it sounds like your bake element itself has failed and needs to be replaced. The convection element and broil element are different elements. All the elements are used to preheat the oven so that the oven will heat quicker but once it reaches temperature, only the particular element is used to maintain temperature (so for example on bake only the bake element is used after preheat).
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The top element is the broil element, the back element behind the back wall is the convection element, and the bottom element is the bake element. So you need the bake element.