HD...
The many ways of "leaving the hold" expressed by ATC, and the rumours of what "they really mean" occupy our brains, and the Route Checkers even more...
Maybe if you think you have said something clearly, and we do not "obey", a little jibe or question might help all... As a QPQ, if we are unsure, maybe we could ask.
IMHO, blaming the FMS is weak - we are supposed to know what the FMS will do (I don't half the time!), but can always override it if we don't like it (so I have to...!)
BRegrds. .NoD