Did you power cycle the sticks?  Even when they're not doing stuff, the circuit's actually still doing stuff, it just draws like 1.5watts.  I've found with these and the 2Pac, at a certain point when it zombie out or does weird stuff, you need to power cycle it.

I do these in order:
- uhubctl power cycling the entire hub where USB hub support software power cycling (I can be lazy and do this through software, usually work)
- pushing the button if USB hub has them (now I have to get up)
- physically removing and then reinstalling the stick (now I have to get up and do physical labor beyond pushing a button, grrrr)

The chips need to be completely power cycled to fully reset.  Unless you pulled the power cord and USB uplink cable on your hub or something, a lot of errors can persist through CGMiner or computer restarts.