So I'm having issues with my buzz pro. It's about a year old but I haven't been using it for about 5 months. Picked it up again but I'm getting very weak hits. The wheel setting doesn't seem to matter and I'm getting weird feedback from a cheap multimeter...the readings fluctuate all over the board and none are consistent. I can throw the same attys on a 5v box mod and get normal vapor production. The same is true of the batteries so I don't think the issue is there. Do I need to send it back in for an update/refurb? What is the typical cost? Thanks in advance!