I have experienced this a couple times. On a previous version buzz box it happened alot but that was due to the batteries being drained in the remote, especially when the backlight is on. New batteries and backlight off goes along way in preserving the life of the battery.
But on the 4900 my battery percentage is around 77% right now and the scrolling was out of control a couple times.
I don't get that safe mode error, never seen that one.