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Most likely oil sending unit or fuel vacuum lock. Easy to check. Run with gas cap loose to allow air into tank. if it still shuts down, temporarily disconnect oil sensor. If the oil sensor is giving false reading and shutting down the engine, just leave disconnected, however, be diligent about checking oil level. Good luck.
It could be a carburetor problem or it may be the low oil cut off switch. Check to make sure oil level is up. If it is check the needle valve attached to the float and the seat. The old carbs used to have a brass seat. Some of the new carbs have a rubber seat and it may need to be replaced. Hope this helps.
The low oil level sensor may very will be causing the problem. Make sure it is fully serviced with oil and then see if it still keeps sutting down at random. If this resolves the problem great. If the problem persists try disconnecting ONE wire from the low oil level sensor. If it still keeps shutting down load or no load remove the fuel float bowl from the bottom of the carb and check for debris. Check fuel flow float bowl removed. It should fill a spray paint can lid in 8 to 10 seconds to the point your worried about over-flow. If you can not get this rate of fuel flow... check the fuel filter, sediment bowl under the fuel selector and the fuel tank exit port. Then clean up the float bowl / bowl nut (or solenoid) and reinstall it.
Still have the problem... start looking at the wire to the fuel solenoid on the bottom of the carb (if used) and the ignition wire to the stop run switch for any signs of chaffing all the way from the start runn switch to as far as you can follow it on the engine without disassembly.
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This sounds like overheating. These small generators don't have overheating protection, but if a low oil pressure or low oil level is present it may be the reason for stopping.
Check the oil level in the starting conditions and again when it stops. It may become under the "stop" level and after some time the precipitated oil has reached the "start" level. The same may be with oil viscosity and oil pressure.
Try to add some oil or change the oil with bigger viscosity.