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You should start some kind of youtube channel for these household 'whodunits'. I know I check in regularly for the next installment of 'what's really going on at Jaye's place'.
Good chance that this is either a leak or blockage in the defrost drain line, or you are building up ice in the walls that alternately melts away then reforms. Work the defrost drain angle first, as it is simpler (we had this from our cat knocking the catch pan askew). You might be lucky enough that it is just condensation on some uninsulated part, but that would tend to be ongoing, not a cycle. On an older freezer, ice can also invade the insulation (like how it works into rock cracks, widening the area each freeze cycle). Since it is the walls, it will melt when the unit cycles off, then refreeze/expands as it cycles back on (and would melt more from oven heat, giving you the intermittent leak when using the oven). You might be able to notice by hand if there are very cold spots. Fix is a major PITA - at very least, you are emptying and defrosting the whole unit - probably not worth it to save the energy costs, unless the leak is going to cause real damage.
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