Just got the phone and went through this mega-thread. One issue I hadn't noticed skimming through was the issue of music playback while using nokia maps drive navigation. If I have music playing through the default player, then try to use drive navigation, music playback becomes choppy/laggy. I'm running the latest firmware on my phone, and my gf's carrier branded v31 5800 does the same thing. Anyone else experience this, and hopefully have a solution?