[BlindedByScience]

When's the last time you checked the calibration on your hygrometer? Replaced the batteries?

When I had a desktop, the only time I had trouble holding the RH with Heartfelt beads was during the winter, with the forced air heat was on. Ambient RH was in the high 30 / low 40% range and the beads had a hard time keeping up. Not their fault, it was an inexpensive humidor. Point being....what's the ambient RH in the room where you are keeping the humidor?

Another way to check for a good seal is to put the whole humidor, cigar, and beads included in a big ziplock bag, or even a cooler. If you use a bag, I'd use two and double bag the humi. Leave it for a day or two, check the RH then.

Also, if you are opening it up every hour or so to check, you're preventing things from working properly. Leave it alone for a day and see what you have then.

Lastly, don't worry too much. This is a pretty simple thing to maintain so once you figure out what is going on, it should be very easy to fix.