That shouldn't be a GPS issue, and would probably also affect any other 3rd party app that traps that button.

It's almost without doubt a hijack issue - for some reason the button press ends up in the player button queue instead of the application button queue. Why? I couldn't tell you... the queue mechanisms aren't the easiest part of hijack to read and understand. It could also be Jiffy related..Now if it happened consistently, it would be much easier to look at..