I have been working with a Dewalt 7491RS for over a year now and I started having a problem with the arbor nut breaking loose. It has happened once with a dado blade (without clamp washer) and once with a regular Freud blade (with clamp washer). Every time before I turn on the saw I check and make sure the blade is tightened down, but I am wondering if anyone has experienced this issue. If anyone has a remedy, I'm open for suggestions.
I can say this it is quiet terrifying to turn off your your table saw and see the blade still turning at 3400+ RPMs then start to wobble like it is going to jump out. I figured letting the blade slow down by itself is the best bet rather than try to stop it with a piece of scrap.