I saw this fix on another site ! I had the same problem on my Xpro 1 .... use an electrical contact cleaning spay ! I removed lens and battery and spayed a little each side of the command dial ! The spay evaporates almost immediately and will dry completely within 2 minutes .. My command dial now works perfectly... There are many brands available but I got Sonax Electronics and Contact Cleaner from Amazon...
Hope this works for you !