So i have the Smok Resa Prince tank. Running it at 70 watts. It worked great for about a day but now not so much. The second day, when i tried to take a hit it tasted burned. I opened the top to check out the coil and air bubbles immediately came up through the coil. I let it sit for a few minutes to soak the juice. Hit it again it tasted fine. Next hit a few mins later tasted burned. Opened the top again... more air bubbles came through the coil. Its acting like there is a suction or vaccuum in the tank and the only way i can break that vacuum is to unscrew the top after every hit. Any ideas?