Bose® QuietComfort® 20i eratic on new iphone 5s

The sound on my iphone 5s plugged into my Bose® QuietComfort® 20i headphones are eratic

Sometimes it work well sometimes they do not. I can plu them in and volume goes up and down nicely

then somtimes after trying to use voice on it i can no longer use the volume level control at all.

I can use the skip function but no longer the mic on it or the volume.

I take my spare pair of bose heaphones out with similar controls just not noise cancel and they also

will not work on volume control.

I take both headphones and plug them in my itouch 2s not running ios7 and they both work great.

I have to reboot the phone to try and make it work again but that is not alwasy the fix.

I have phoned up Bose who think its the headset and that I should mess around with UPS and wait another 7 dyas while they fix my brand new £250 quid headphones but personally after the checks i have done i think its the ios7 bug somewhere

Can I be the only person with this problem ? if so maybe i should send both pairs of heaphones back ?

I have also just completeyl wiped iphone in case it was a blip bug but no still same issue

Help

Darren