Kenmore 52153 Stainless Steel Kitchen Hood "fan starts automatically" Questions

Fan goes on and off, automatically... it has it's own mind Our fan looks like the one pictured. The fan has started coming on and off randomly. Yesterday I just turned it to max, then clicked on the ...

fan normally automatically come on. The light works but all of a sudden the fan no longer works. Any ideas on where to start to check out the problem? Sounds like a motor problem...but not necessarily

...automatically Downdraft should stop when it reaches its highest point or when it lowers to the counter top but unless the unit is turned off it will continue to go up and down. Would like suggestion ...