I would hope they have some insight. This is not rocket science. What would be valuable is someone who has catalogued the error 25 causes. It is out there.
This setup is used elsewhere. This type of community is a start. Maybe the RADROVER folks have some insight. After all, we are all warriors of road and trail!!!
Yeah error 25 does seem to pop-up quite a bit and the brake lever switches seemed like a possibility, and could be a cause, but it appears not in all cases. Based on what you found it sounds like the error maybe caused in the controller, more to come I'm sure.