I had this happen (the freeze) the other day, luckily I was standing near it to realise. It stopped moving but everything else was still going, it continued extruding etc. I turned it off and rehomed it. Fortunately it was at the end of the print so I only had a bit of filament to clean up. Could have been a lot worse I imagine. I've also had it happen where the dial has become unresponsive, no error issues though. The display also flickers at times and the machine likes to reboot itself when I'm selecting a print/tuning something. I've been in contact with the company I purchased it from, as I've had mine less than 2 weeks, and been told just to see how it goes as it may need to be sent away for repair. Sadly no advice here but will let you know how mine fares!
Ilara