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Hi Joanna1234.

I think it possible that your heater cartridge is on the point of failure. I had similar symptoms some time ago and cured the problem by fitting a new heater cartridge (I also used Kryonaut thermal grease from thermal grizzly to couple it, and the thermistor, to the heater block). It could also be broken wires or loose connectors on your heater or thermistor.

Please post here with whatever fixes your problem.