Im not sure the reason for the breaking. It may be a confidence thing. I can do a reliable sit stay (with other dogs around) for a distance of 3-4 meters. But when I push further out, ie trialling CCD distance she drops. She usually drops in the first 5 seconds I move away from her, but she stays in the lineup and the other dogs dont seem to phase her.
At home I have practised as many places as possible. Every park and oval around town, so its not just in the backyard where she can do it.
It seems like she is kinda saying "so what are you going to do about it" and of course I cant do or say anything. Have tried lots of postive re-inforcement when she does it right but so far that has not been in a trial.
P, I honestly havent tried some of the things you suggested. Will make that my next project. I like the idea of getting her to sit stay when I am gardening and generally moving around.
Dogdude, focus is always going to be the issue with a gun dog. Just to many birds out there! Saying that I have been doing alot of work on focus of late and seem to be getting somewhere.
Thanks for the suggestions and please keep them coming.