Why my Samsung Galaxy A73 auto restart anytime

This could be a software issue that an update or a factory reset could fix. Some times also a bad battery. Also check that the volume up , down and power buttons are working properly, i had a lot of cases that volume down button was stuck and permanently on that causes force restart to the phone of you press it with power button for a long time. so if the phone restarts one time the. It causes boot loop.