As someone who lives in a very wet region, it sounds to me like there are probably issues with the work the farrier is doing if your horse is losing shoes that often. The fact that chunks of hoof wall are coming off with the shoe implies that the hoof wall was too long to begin with. You might consider taking some good hoof photos and having some of the experts on here give you some feedback on the way the hooves are being trimmed/shod.
“The horse is a mirror to your soul. Sometimes you might not like what you see. Sometimes you will.” - Buck Brannaman
"Nothing forced can ever be beautiful." - Xenophon