Display shows 0:03 flashing message

I was doing a session on the indoor trainer and I used the Edge to set a fixed resistance at 20%

When I started the timer the image below started flashing regularly on the display, making it almost impossible to see the numbers related to Power, heart rate, etc...

With the same trainer and the same activity profile, I follow schedules generated in Training Peaks without any problem.

The digits on the display don't change, always 0:03

Any idea how to fix it?