Okay, this is odd. Started this morning. The buttons at the bottom of the phone (not the hard-press buttons, but the lower row of touch-screen buttons -- dialer, open app list, and contacts), are non-responsive. Everything else seems to be working okay. Tried powering off/up, also tried battery pull, still the same. I'm close to opting for "restore factory settings", but I've spent some time customizing, and that's really a last resort. Any ideas? TIA!