I've had the same happen pretty consistently. I have another issue that when I have my A40s hooked up via optical, it'll randomly break the audio up. I have to reset the system to fix it. Funny thing is, it happens 100% of the time when playing NBA 2K14, so I can't use my headset at all when playing it. Downloads don't download automatically for me, even when I have it in standby. Disc wont eject sometimes. This started off early where only the button wouldn't work, but even if I try it via the "start > eject" method, it sometimes still wont work. I have to reset it and then it works fine.
Add that to the numerous game crashes and freezes I've had and it definitely hasn't been a very good experience.