I've got the same problem, except my pod go is completely dead now! I have a case open with customer support, I'll let you know if they give me any advice that fixes it
EDIT: I had to step it back to firmware 1.4 and it worked perfectly and brought it back to life. Once I'd successfully got it back to 1.4 I was able to do the 2.0 update again and this time it worked perfectly.