4K box stuck at “Welcome” screen.

I came home today around 4:00 PM and turned my tv on. The display showed the “Welcome. Bienvenido. Bienvenue.” boot screen. I waited a while and it never changed. I unplugged the power for 30 seconds and attempted a hard reboot, with mostly the same results, the only difference being that now the “Welcome etc” screen flashes periodically until it turns off completely. 
The box is also quite warm. 

Please help.