Our posts crossed in the ether. I would talk directly to Hunter Factory rather than their agents. The factory would know if this is a frequent problem and whether there was perhaps a bad batch of material out there around the time that your boat was built. But they should also be able to detect whether an inapropriate solvent was used.
Even if the fault was your use of the wrong chemicals or how you store the boat, Hunter tends to have reasonably complete owners manuals and if they did not caution you against using inappropriate solvents or extreme the cold or storing the boat full of snow, then they should have some liability and may help you straighten this out.
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Curmudgeon at Large- and rhinestone in the rough, sailing my Farr 11.6 on the Chesapeake Bay