Yeah that is pretty common. I have gotten that on a bunch of my Garmins. It also happens if the day starts out really muggy and then gets nice and dry.

Bling mode: Splurged and got myself a S-Works Romin Evo (Upgraded from the Romin Evo Pro, I am "that guy" now). I even broke my caridnal rule about bike maintenance the day before my race and installed it. Thing was amazing, I know I love the Romin Evo but this one has less padding and I love the feel of it. Romin Evos always seemed to have just the right shape but just a bit too much padding. It is sort of annoying that they only make their minimal padding ones in the most expensive version.