A couple $($Buyers$)$ buy a motor RV in Nevada from an RV dealer for the express purpose of long trips to tour the USA. They take several trips, but they don't get too far before the RV overheats, and the AC doesn't work. Over the course of $18$ months, the RV is constantly in the shop to resolve or cure these substantial repair issues to no avail. In fact, the RV is in the dealer's repair shop on and off for about $7$ months out of the $18$ months. Finally, after more than $18$ months from the purchase date, the buyers revoke their acceptance of the RV and demand their money back. True or False, the buyer's revocation of this commercial sales contract was reasonable under these facts?

a$.q,$ TRUE.

b$.q,$ FALSE.