Measure how long your collet is. Then insert your bit that distance for the best grip on the router bit. Inserting too far or too little is not good. If you are getting consistently stuck take the router out and polish the inside of the router shaft. Makita and C3D routers do not have the collet attached to the collet nut so the spring of the collet is all that makes it release. The nut when loosened does not pull the collet down like on a Dewalt and/or Porter Cable type collets. Use some 600 or higher grit paper to polish the router shaft interior. You could use a Dremel if the paper and the rubber are small enough to get inside. I would not use any stone type media because it is easy to over due the polishing.