Playback problem

Hi folks; - please - the attached was originally written in MS#3
it plays bars 1 thru 28 and repeats correctly as scored, but then plays only to
circa bar #75 whereupon it restarts to bar#1 (first time) and repeats as stated...
This is most frustrating - it should run to bar #104 before restart???
My thanks in advance to anyone who can resolve the anomaly,
Cheers, John