Never seem anything like that but Im willing to bet that's its your TV and not the dish. You can test by connecting a DVD player or game console to the sane input the dish is on and see if it continues.
We just now saw that funny display while watching a recording on our Joey 4. It popped up for about a couple seconds. Wife says she has seen it bunches of times on our Hopper 3 Plus all last week. Hopper was then on version H382. It's now on H383.