Concerning the voice function, after the 15 min. time-out on my Vader I had to remove the batteries, re-insert them, and wait a few mins. before it would work again. No idea why. When I first re-inserted the batteries and it didn't work, I was ready to call SSC. But when I came back to it again, it worked. I can't explain why that it is.
Anyway, just wanted to share my experience for those who think their voice feature is busted; you may want to take another look. Take out the batteries, put them back in and wait a good 20 mins. or so. Then flip the switch back on. Make sure you have the batteries in correctly, and the switches are off on the figure and remote before re-inserting. This is what worked for me the two times I let the 15 min. time-out happen.