I updated to 4.0 beta. The unit was fine for about a week or so, Came in this morning and powered up. I noticed that the screen was stuck on "loading program". Cycled power. Same result. Re-installed 4.0, powered up, same result, stuck in the fetal position. Very odd, considering that it was stable yesterday. I'll guess I'll try to "downdate" it back to 3.5.