I’d agree with Oreo, that it sounds like you’ve got a non-awesome person on the other end of support (pretty rare for the Vector/Rally support folks, who are actually usually the opposite end of that spectrum).
In any event, for funsies, try pairing up your XC200 with some other power recording app, to try and narrow down if it’s the pedals or the Edge causing issues. That could be TrainerRoad, or honestly even just the free Wahoo Fitness app is a good one I sometimes use as a backup recording method for power meter testing data. When doing that, turn off your Edge unit, to ensure it’s not causing the issues somehow. If you’re getting dropouts there, then it narrows it down to the set of pedals. Whereas if you get nothing, then somehow the Edge may be the issue.