This is either a problem with the thermostat that lives just under the surface of the bottom of the aeroccino jug and is a technical problem that can only be resolved (replaced) by returning it to Nespresso OR it is related to a fine layer of burnt milk that builds over successive use that builds and holds the heat the element produces 'tricking' the thermostat into thinking the milk itself has heated to the desired temperature, not just the burnt layer. Clean the bottom of the jug, regularly with a non scratch scourer and use a mild detergent as well.
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This is either a problem with the thermostat that lives just under the surface of the bottom of the aeroccino jug and is a technical problem that can only be resolved (replaced) by returning it to Nespresso OR it is related to a fine layer of burnt milk that builds over successive use that builds and holds the heat the element produces 'tricking' the thermostat into thinking the milk itself has heated to the desired temperature, not just the burnt layer. Clean the bottom of the jug, regularly with a non scratch scourer and use a mild detergent as well.