[markem]

It is likely that the drier air is to blame but it is also possible that you are light on the amount of beads.

For my desktops, I put a shot glass full of distilled water in during the winter. The uptake is pretty slow with the water lasting several months. I also use a beeswax polish on the outside of the one desktop that isn't sealed.

Note that the wood (the Spanish Cedar part) should only be taking up water when the humidity is near/over 70%, so it likely is not affecting your environment. Some like to re-season at the start of the local dry season to help ensure a stable environment. I used to do this.

Oh yeah, I did not experience this problem when I used coolers, btw.