Went through list of possible causes; checked load distribution in the tub, looked ok. Checked several loads with same results. Thought maybe a broken balance spring or clutch problem. Pulled the machine out and took off the control panel. Pulled the front off the frame and during disassembly broke the lid switch by neglecting to lift the lid to release the switch first. Oh well, that was a lesson learned the hard way. Had to remove the back panel with all it's wires and hose connections. Checked out the springs and none were broken or missing. Made a temporary electrical attachment to the machine. Checked out the clutch, engaged and disengaged properly and spun ok. Not knowing if one of the springs was more worn than the others ordered set of three and one for the frame base attachment along with a new lid switch. Everything arrived quickly and was exact replacement parts. Installed the springs, reassembled the machine, opened the lid to install the new switch and then closed up the control panel. It has performed well in the test cycles. Not bad for a 10 year old washer that gets regular use. Had to replace the drain pump 2 years ago due to a leak. That was an easier job.