Shilala Beads

[kaisersozei]

Zombifying this thread to ask a question & get opinions:

I've had 8 oz of Shilala beads in my glasstop for a long time. After resealing the humi last year, it's maintained 62% pretty solidly year round.

Haven't had a cigar from there in about 10 days, but when I passed by this morning I took a peek at the hygrometer and it read 67dg/50%. 50%??!?! The temp is correct, so I'm not thinking it's the batteries. I'll do a recalibration this weekend, meanwhile can anyone explain that significant of a drop in humidity? If the beads need recharging, will they gradually lose their moisture or can it be that precipitous?

Thanks for your thoughts!