I purchased a XBox X (brand new in box not been used - from listing) as a Christmas present, it was opened on arrival and contents confirmed OK. On Christmas the Xbox was powered up but needed resetting to start, not sure why? Since then Xbox X will run for about 20 to 30 minutes, then disconnect from the controller, then the Xbox shuts down. Another controller has been tried with similar results. The Xbox X has to cool down before restarting. Microsoft say this Xbox X was registered 6 weeks before my purchase, won't give anymore details. Tried contacting seller but no response, they have been a seller since 2018, there feedback was positive, but all the seller's listings have now gone and their name is in red, What should I do now?
NB. If I return the Xbox to Microsoft under warranty, they say it will be replaced with a refurbished Xbox because I am not the original registerer