You have two options, and both are easy fixes. The first one is contact Bosch, and they will send you a new switch. This is a known issue on the older versions of the router.
Since the first option still requires you to open the router and pull out the switch, option 2 may be worth trying as well. The problem is that the switch isn't sealed and sawdust gets into it. Once you get it out, the switch will pry apart fairly easily, though you will need something very flat to assist you. There are several small pieces inside the switch so be careful. Once the sawdust is cleaned out, reassemble the switch. You will know it is put back together right as it will click on and off as it should. Put the switch back into the router, and it should now run good as new.