@Dale_Chamberlain: A hot end temperature swing of 203-219C is excessive. You should probably start by calibrating the hotend PID values. (Reprap Wiki has a pretty good writeup of the process. Don’t forget the M500 command to save the new values to eeprom.
That said, the problem may not be the PID settings. A number of folks have identified an issue with the thermistor not being properly retained in the hotend. You might check out this forum thread: Constantly replacing hot-ends