Hi i think I've sorted it out for now. I did the following. Cleaned the 510 connectors. Changed to space coils on SS as it was likely coil gunk that was messing with the temp readings? Also I didn't lock the resistance. Should I be? I'll have to use it a bit more to see if the problem re-occurs. Power mode with Kanthal has returned to the normal as well. Fingers crossed because i love the way the DNAs deliver power, its just so smooth compared to my other mods. Thank you for responding Rob_H