Is it normal for bluetooth connection to have interference?

I use my phone to connect to and listen to music via bluetooth compatible speaker that is mounted on my bicycle. The speaker has no settings to adjust other than volume.So, as I travel through neighborhoods, the bluetooth loses it's connection for a moment and then it comes back. Very annoying. I could connect with a hardwire connection to the phone and speaker but I prefer the wireless connection. I'm not sure but it appears to be that other Wi-Fi networks in the neighborhoods are interfering with my bluetooth connection since it happens more often in crowded neighborhoods than when I'm out on the highway shoulder in the countryside.

Has anyone ever experienced this and is there a setting in the phone that can isolate my connection to my speaker and filter out all other Wi-Fi interference?

iPhone 5s, iOS 7.0.4

Maybe your phone is having a similar problem to the problem I had with my Nokia X6 and bluetooth headset. When playing music and walking through town it kept pausing and stuttering every now and again. What this turned out to be was the phone was trying to join every Wi-Fi network it came into range of as I walked past the houses, which was making it too busy to either play the music continually or maintain the bluetooth connection. Switching the Wi-Fi off before going out stopped it, with the extra advantage of saving battery power.

Your problem might be different but it could be worth giving this a try.