Hate to say it, But i had 2 RC Kick Drums (22" x 18", 20" x 16"), and also a Oak Custom 22" x 16" that have all cracked on the Beater side.. Still to this day don't know why?? All kicks were about a year old.
Must be a common fault.. A friend of mine has the same on his Recording Custom..
They all cracked on the join.
They were always transported in hard cases, and always looked after.. But all cracked.. I never chased it with Yamaha, as i had them fixed, and couldn't wait for new Hoops, as they needed the old hoops, and i'm always using the kits on sessions and gigs..
I wood glued the hoops (find the strongest wood glue you can get), and put some Fibre Glass/Resin tape over it on both sides, then put it where the Kick Pedal attaches. It's tougher than the original joint, and also protects the wood, so you don't need the rubber over the hoops.