Some Possibilities
1) above temps that will scorch Cotton
2) Possible
change in coil resistance effecting Base calculations
3)Jules over ramping set temperature.
I have seen several shifts in Base resistance on various Ni and TI builds. Possible Barometric pressure changes, or actual coil fluctuation.(no idea why)
I now check and relock my TC mods before use each day and have seen a few hundredths shift.
One coil on my SX mini jumped from .076 to .110-.112 and seems to now be happy there.
TC is still fairly new and I have a feeling we need to learn a lot to overcome what may(or not) be user errors.
I do NOT intentionally Vape dry and try my best not to accidentally do it. I'll leave that to the Reviewers. To me Safe is me doing the right thing at the right time.