printer stops while printing PRIME TOWER

[fundamental4 0]

hi all,

 

need help, please.

 

cura 4.0.

I have one STL that I'm trying to print with 2 materials. While the printer is printing the prime tower (1st layer with 1st material) the printer stops, about 20 minutes after start.

As you can see in the picture below, it is always in the same position.
On the left gcode1 (3 different tests), one is full and 2 are only the prime tower base. In the base you can see the stop point. (2 STL: main part and 4 adhesion rings).
On the right gcode2, (STL without adhesion rings).

The problem happens while printing prime tower, not during heating, nor cooling, nor extruder switch.
The message in the display is:
"...
Error: Temperature
Printer stopped.
Please reboot.
..."

What is wrong? 
how can I solve the problem?