Router issues

My Triton router which has been mounted in a table for some time know has starting issues. When I flick the switch to turn it on, it sometimes moves a tiny bit then stops, or won't move at all, like its getting stuck. I got a new pair of carbon brushes and replaced them, but doesn't seemed to have changed. I usually just unplug it, give the bit/collet a spin (not with my hand), then plug back in and try again. Sometimes works, sometimes takes a few goes. Happens at anytime, ie. first use for the day, tenth use for the day.

Any ideas on what some other issues might be?

Thanks

Shane