I get freezes, too. It seems to happen when you leave the device unattended long enough for the screen to shut down (at least that's the case for me, as I have the screen set to shut down after 30 seconds). I think you can avoid this by returning to the Main Menu before this happens.
Plus, I can't seem to easily get the radio to change from "Preset" mode to "Seek" easily. As soon as I open the radio, it changes back to "Preset" mode. The only way I can do this is to return to the Main Menu and select FM Radio. Then, I hold the center button to open the FM Radio options, and select Auto-Scan Presets. I can then cancel the process, return to the FM Radio options, and change to "Seek" mode.
Is this a bug, or am I just missing something. One thing's for sure... It sure is hard to add my favorite stations as presets.
PS: Pamaury, you rock for everything you do!