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I have updated to iOS 8.1.2, till now everything ok besides some little bugs:
1) when I turn on 3G Data the signal strength goes to 1 line and then write "no signal". after couple seconds the signal is goes back with 3G data ON. this happens to me even on iOS 7.0.4
2) When I hear music with my Sennheiser HD219 the volume decrease a little bit and if I touch on the time length line the volume increase. That's happen also on 7.0.4. just to be sure I will continue listening to music with others headphones to verify the glitch/bug.
 
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