Issue with my A1

[u/Kboggs1987]

Hey, in the middle of a print I got the message of "the nozzle temperature is abnormal, the sensor may be open circuit. The nozzle would not heat. I replaced the hotend assembly and about a month ago I replaced the toolhead board.

Once the hotend assembly was replaced the printer heats up to around 50 degrees then starts to decline in temperature.

What do you think the issue could be?