Trigger broke on my Futaba 3PK, it's the only trigger that's failed in 25 years
You should be able to get a new trigger, get in contact with the distro (RC Disco) or a decent shop should be able to sort you out - though it'll probably mean you taking the thing apart to replace it which is a pain.
I use the Sanwa M11 myself, it's a big bulky beast but it feels really nice to use. I think RC Disco had some good deals on KO transmitters on their website last time I looked (and some insane deals on KO Servos) so check them out maybe.