Sampler track only plays if started at beginning on Logic Pro 10.4.4

using logic 10.4.4 - I have recorded a drone track using an ESE keyboard. It will play if I start it from the beginning but won't play if I try and start it from anywhere else. Ideas?

(Have tried shutting everything down and firing up again but no joy there)

[Re-Titled by Moderator]

Original Title: Sampler track only plays if started at beginning