Please try using a cotton swab dampened with a tiny bit of rubbing alcohol (squeezing off any excess first) to clean the contacts on both the pod and inside JUUL where the pod is inserted. This should restore the connection between the pod and the device if any moisture has got on them.
There may be a few tiny air bubbles down by the wicks of the JUULpod that can also contribute to the issue. Please try taking the pod out and gently tapping it (mouthpiece side up) on the table and reinserting. That should make the tiny air bubbles rise and re-saturate the wicks. You may also want to try using an alternate JUUL pod to see if that helps.
If you continue to have problems, please retain the affected device and contact the JUUL Care Team.