I don’t have a possible solution to your problem, but just a comment about thermal in general. It’s sad to hear this problem, given that thermal scopes cost so much. Most guys struggle financially to get a scope, that they think will be a good investment for better hunting success, only to learn of issues later. Problems with thermal seem to abound, and yet some guys like myself have had good experiences. Thermal is a game changer “when” it works as it’s supposed to.
To my way of thinking based on observations over a period of time, and maybe I am wrong, but it seems the cheaper thermals in general have less issues than some of the higher priced ones. A good example was the Pulsar Apex vs. the Trail models. Pulsar pushed the more costly Trail models hard and discontinued the Apex, but the Trails were riddled with POI issues while there appeared to be few problems with the Apex. I think Pulsar messed up when they discontinued the Apex.
It seems risky to make a purchase of thermal. The only silver lining in all of this boils down to customer service. If a company has good CS then the gut wrenching frustration can be lessened somewhat, but a season can easily be ruined by a bad scope and all the time it takes to get the issue resolved. Still, I can’t imagine living without thermal after having used it.
Maybe / hopefully things will improve in time. I wish you well with resolving the issue and hope is doesn’t impact your season too much. I know it has to be very frustrating.