How can I train clients remotely? Skype is unreliable.
Have you taken a look at this thread? Looks like some of the trainers here are successful with Skype. You might message them and see how they are making it work.
https://www.ideafit.com/answers/skype-personal-training
One of the suggestions I liked was communicating via Skype, sending exercise video instructions, but not trying to coach the workout itself “live.” Maybe that could work on the days that Skype is lagging live.