Are you sure you installed it correctly????
I recently went to inspect a 10k bathroom remodel
where the "plumbers" actually used a normal pvc
shower drain and simply lapped the membrane into the crawl space..
and the n poured concrete right up to the shower drain...
and it leaked in less than two months....
did you use the right type of shower pan drain with the
locking clamps to lock down the membrane??
if you didnt , then you are screwed