I've had mixed luck with mine. One of them actually had the opposite problem of yours - all the bananas rotted off. Eventually the whole cluster fell off. I disposed of it...the plant itself is still happy and growing, and seems to be trying to develop some new tiny bananas.
Two of my others went the same route yours did.
The Boy Feesh: Indigo CT, Lavatail CT, Ghost CT, Chicory HM, Redfish VT, Magic DT
The Girl Feesh: Christmas CT, Shine VT, Snowflake CT, Stripes VT, Midnight CT, Grif VT, Tangerine VT, Wraith CT, Amethyst VT, Ice CT, Poe CT, Turquoise II CT