So recently i have notice after building, installing, working out hot spots, and allowing to cool back down to room temp. When i fisrt fire my coils in temp control mode instead of a temp reading it displays "off" and not running in tc mode. But i allow my device and rda to cool down and use again later it runs perfect from then on, even after cotton changes and fireing to get the gunk off. Why do fresh build seem to need a "break in" period before tc works properly?