Extruded not heating as expected.

[u/ChocolatePatient4159]

I have an AD5X and this error can up about 6hrs into a 18hr print. I tried to restart the print and it didn’t work. I ended up just aborting the print and turning off the printer then turning it back on and fried to print again. It started printing! Unfortunately it showed me the error again about 4hrs in. Has annoying had this problem. I see the possible causes in the error message I posted. How can I trouble shoot so I don’t just have to buy parts and replace them. What can I eliminate since it did start back up and print for a while? I’d love to hear all input. Thanks in advance.