Everything has a lifetime. Beads technically do not wear out, but they do absorb stuff and have reduced effectiveness as a result. Still, we're talking years of service.
Yes, but not of the magnitude that you are experiencing.
A wipe of the lip with a bit of distilled water may help, but I've found closed-cell foam tape helps the most on budget humidors.
One-two week refill times implies an air leak to me. Can you point to a pic of the humi. online?
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