When you hear other programming it is is either a technical error or someone else has precedence to air their content before WBMX.Com does.
This is not an official statement but an observation, so no getting your panties in a bunch.
For me, when that happens, I simply hit up one of their apps to access the stream. As a last resort, there is always WBMX.Com mixes rolling on AddictedToRadio.Com
Happy New Year!