Sirius Sportster R stuck on logo after overheating

My Sirius Sportster R, which has lifetime activation, overheated after being left on overnight. It was hot to the touch. After cooling down, it now turns on but is stuck on the Sirius logo screen. I am unable to send it to Sirius XM for repair due to the lifetime activation. What could be the cause of this issue, and how can I troubleshoot or repair it?