Not sure Jan and Cliff could be a overheating issue or water damage but mine was as simple as a short in the cord end where the prongs are. After years of heavily using my DW745, usually on ground (stand is always buried), blade shroud off and ripping everything including treated 3x, i always kick the power switch off with my foot after a cut, im pretty rough on her. The factory prongs that are folded over became brittle,black, split and broke off over time. I replaced the end...twice since then. At one point it was kicking on/off rapid while I tried to bend the cord back and forth. I believe wires were arcing in plug end so I electric taped individual wires then reassembled. Saw works great and still have a second saw sib because I originally purchased at HD for $250. Went in the next day and clearanced out to $200. I always use a gfci, and plug in table and miter saw direct when possible. If not use a 10 Guage surge protect extension cord. Test the saw with a small ac / dc current pen tester to check if there is still power running past the switch assy after it kicks off