With the Master, I've found if you 'help' it with the feeding (A little slack and such) and use a shorter max distance setting, that it minimizes the wandering issue altogether.
It seems from my reading that people's problems usually vary in severity; Everyone has quirks to work with. However, some seem like they are more mischievious than others.
I had a great suggestion from someone and I have seriously thought of it; A --GOOD-- power conditioner. This is different than a surge suppresser; SOME battery backups do have limited power conditioning functionality, but a good solo power conditioner. I know Monster does make some really good ones with some nice Caps in them, but I've seen many others as well which supposedly do even better. The key note with all of these is that your ground plug you plug the cutter into IS properly grounded out.
The logic here seems to be that although the company says its a 'static' issue, that in reality that the logic board isn't built with EFI or power line noise in mind, and that any natural noise on the line could cause issues. The noisier your powerline, the worse it could be. That could explain why some people have less problems with the Master than others; Less 'dirty' power supply.
I have worked for a few businesses where power cleanliness is key; If you think thzt your home/business power is clean, you're in for a BIG shock; It is so noisy that I'm surprised that most electronics do work. I used to have a really cool gadget that would 'audioize' the line noise; If the line was clean, it was a very hard to hear hum. Anything else would come through frighteningly noisy and loud. MANY times I'd pick up radio stations (Especially in one area), cordless phone conversations, harsh black noise, or many, MANY other sounds (Including pulsating/thumping/etc as other items even blocks away were power cycling).
I think that anyone with a Master who is having problems, should pick up a GOOD power conditioner and tell us if that at least helps the situation.
As for me; Ever since I did a bunch of steps (Bought a VERY thick data cable; made sure I ran the cable away from any electrical sources; ran the unit on its own circuit; keeping the board clean and dust-free and keeping it cool with a fan circulating air), I have managed to get it to run almost dead-on. What I do get is only on longer runs now, every 10 to 20 feet (or longer), it will make one cut slightly longer than it's supposed to, but quickly corrects itself; And unless I'm watching for it, I can never find it in the final product.
Hope this helps