I think it's a common problem with young dogs who see too much mechanically thrown marks. Put the remote equipment away or only run singles off the electronics. You cannot replace helpers in the field for teaching/training for switching. In some cases, I think it's merely confusion on a new concept and the dogs break down. Seen people get really tough on a dog for switching(I've been guilty of it) yet, probably really wasn't truly a crime because the set up may have been more than the dog had seen before or an unknown/trained concept.
I'd make sure you have a set up which is simple and very well understood before any corrections start. That's where I've made a mistake before- That can snowball into a bunch of other problems.