My smok AL85 has been having issues. I have tried three batteries out of 6. I have Samsung 25rs. Whenever i put a fully charged battery in and take a hit, the battery percentage jumps down a few notches to 70% then jumps back up. Sometimes it jumps all the way down then back up again. I am using the tfv4 micro with Clapton dual coil. Had no issues in the last 3 months since I've had the same batteries and tank. I'm on the latest al85 firmware. Do I have a faulty mod? Thanks