NO ActivSlate Signal...?

[spearl5996]

All of a sudden I'm not getting a signal from my ActivSlate. I've checked for upgrades - there are none. I've checked and my ActivHub shows that it is picking up both the slate and the board. It won't allow me to reregister (seemingly because it doesn't need to be). Everytime I turn the slate on it just gives me two question marks ?? and --------with the signal symbol. I think I've had this happen before and it was a quick fix.

I have no clue why it's been like this for weeks. Any suggestions? ????