Im not so sure if its the signal bouncing (this case NOT bouncing) off of items and walls, but maybe more along the line of the sun's rays dissrupting the signal. When I went hiking in the winter, I would clip my case on the hanging tag of my heavy jacket, which in turn would lay at the base of my neck and not be bothersome. In biking however, I dont have that option (and I ride a bike path AND check behind me often, so no worries bout getting ran over). I do have a hydro pack that I never wear that I could clip it on, however I really dont like wearing anything but clothes when I bike cause they'll just get sweaty. And I dont have any other BT devices to test it on. However, a friend of mine has the same 'phones but a windows based phone and he doesnt have a problem. But that really dont help me much, cause it could still be one or the other. Just wondering if theres anyway to boost the signal or something to make it work better w/o wearing my BB around my neck..................