Hi there-- I've been making sure I've been buying official elfbars, but I'm running into a issue, specifically with Berry Mix on the BC5000. For some reason after the first recharge cycle they can easily burn once they are on a full charge. Usually I can get a few charges and ~5000 puffs, but this is happening very early after buying and only the first charge cycle. This doesn't happen on other flavors. Can you advise? -J.s.