Head stop to move during a print

Hi there, hope someone could help me with this issue. :pensive:
this problem it happened in different kind o prints and both during a cut or a drawing. During a print (not a specific one) the head stops its movements in a casual point while the control panel continue to show a correct countdown and performance of the print. Also the air fan continues to work properly, only the head remains blocked.
More over, right after this issue is happened, if I turn of the GF I have to wait several hours to be able to turn it on again.
Thanks so much for any help.

EDIT: I forgot to underline that also with the movement also the laser stops.

What is the temperature in the room housing your Glowforge?

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The temperature in the lab is around 20°C (now in summer)