I just got my Protank in the mail today. I filled it up with some Volcano brand e-juice (20/80 PG/VG?) and it worked great while I puffed on it for a few minutes. I was psyched! Then I put it down, and when I picked it up an hour later it was a gurgling mess, and shot liquid up into my mouth. I thought that maybe the thin juice was the culprit, so I put in some VaporChef 50/50 Unicorn Poop and had the same issue. I can unscrew the head and blow out some juice, but that only solved the problem for a few minutes and it starts gurgling again. I did try it with both wicks stacked on the coil and then removed one per Pbusardo's review, but it gurgles either way.
Has anyone else experienced this? Any solutions?
Thanks in advance.

EDIT: Thanks for the help guys. I've got my ProTank running smoothly now. I took the head out and made sure everything was nice and tight, then filled the tank to max capacity with some really thick e-liquid (I added enough VG to my 50/50 mix to get it to ~80/20 VG/PG. Cheers.