See your local enterosto-therapy nurse. Too many reasons for leaks, most correctible. Easy cure; is he rolling over on it in his sleep, applying pressure to a filling bag and forcing material out under the wafer? Maybe emptying fully before bed and again about 4 hours later (while he sleeps)? Just a thought. Good luck
Pressure - It can turn a lump of coal into a flawless diamond, or an average person into a perfect basket-case.