[Bob N]

Hi and welcome to the forum.

From what you describe it sounds like your router may be overheating and shutting itself off automatically to keep from burning out or else the heat sensor has gone bad.

Is it possible you are trying to remove too much stock at once and putting too much strain on the motor? Try several passes per cut taking less stock down per pass. You may have an under powered router for the job and need to make shallower cuts per pass.

Just my guess of course.

 

[Bob N]

It is beginning to look like reible (Ed) may have the problem pin pointed for you.

Sounds more like the locking device switch more than an overheat problem. You may want to operate and see what is going on internally. Me, I work with tools and not on them. Not real good at either