I Have a provari and a kayfun, I have been using it for a while and made a new coul for it a week ago and check it and it was at 1.3ohms, it worked fine for a few days then i notived the vape getting extremely weak, so I checked my ohms on the provari and it says its 3.6 ohms? Then i check it again and it says 2.7? when im checking it its always changing and going down during the check on my provari. So whats going on here? Is it safe to vape?