ferqui

I have an Ultimaker 3 extended and when I send a job to print, it starts well, until some time passes and the printer suddenly restarts and says that there has been an error with the printing, but I don't see any error code. I have noticed that before it restarts, the leds on the printer frame start to flash. This has also started to happen after upgrading to the latest firmware. Any idea what might happen and how to fix it? Thank you