If you are using the Qidi Tech 1, I had the same issue essentially. I didn't ever get it while printing PLA it always seemed to reach the 190-200 range fine. When I began printing ABS it would hang about 224-226 when I had 230 set. If I reset the printer (power on then off) it seemed to work the next try. Almost a every other power cycle kind of thing. Emailed Tech support and they ended up sending me 2 new extruders and a thermocouple at no charge. Haven't had the issue repeat since. I am using Simplify 3d as my slicer.