Does the front control panel seem to get very hot?
Can you feel a fan blowing air through the front at the top of the door?
How long does it take for it to come back on?
Ok there isnt much techincal info on these machines so i dont know what parts you have fitted.
But going of the fault you describe it could possible be a thermal cut out stat thats faulty.
Try pulling machine out and take the top and back panels off.
Have a look on the back to see if theres a small thermostat. It will have 2 wires going to it. Check to see if its burnt out or loose wires as if there is then this will cause the problem.
Also with the top off have a look at the switchs there. Just make sure the selector switch isnt burnt out. As these are the most common problems for causeing this fault.
If you need anymore info just gte back to me.