Hot end just stops working

ok so was printing the tugboat calibration file and everything was going fine then all of sudden I see these errors in the console. I took snapshots of the errors that occurred during the print. I would say about 15mins into the print. I hope to get his figured out as what was printed was of excellent quality. Any help would be appreciated.

Forgot I have SM2 A150. For this print I was connected to my computer via serial port. When trying to print sending via wifi or from USB failed as well. Same issue with the hot end heating up then cooling down before the system even starting printing. After the first error the hot end got hot enough for the machine to continue but the second error shut it down. I had to pause then stop the job.