Use a cotton bud with rubbing alcohol (squeezing off any excess) to clean the contacts inside the JUUL device and on the JUULpod. This should restore the connection between the pod and the device if any moisture has been in contact with them.
Gently tap the JUULpod, mouthpiece side up, on a table and reinsert it into the JUUL device. Any tiny air bubbles should rise and re-saturate the wicks.
Insert an alternative JUULpod to see if that helps.