I tried that once, but it never got pinned, I'll try again, but I'm going to wait until I can add the Machine Gear, from the reviews it looks very promising and they just upgraded the prop (it's more like a circular conveyor belt than a prop, but it functions similarly to a standard prop) and the board with a few unconfirmed reports with the shell being nylon now. I'll wait a few months until there's more reviews and comparisons out on it and I'll add it to the comparison with a hopefully end all thread if I manage to get it pinned.
I don't personally have a G6r, so I don't know for sure if that's normal, I know the battery meter should flash continuously with low battery (as stated in the manual) but I don't think the whole screen should flash continuously. I would suggest going to your local field and talk to people with G6r's and see if they have the same problem, but in the meantime I would just replace the battery. I don't think your issue should affect the performance of the marker at all, but if it's really bothering you contact Bob Long Technologies and see if they can resolve your problem.