Wirelessly posted (8700g: BlackBerry8700/4.2.1 Profile/MIDP-2.0 Configuration/CLDC-1.1 VendorID/100)
And post an update after you try a fix.
It is peculiar that it's fine in the holster. Is it possible that the cable hangs differently or something when holstered such that a connection is closed while in that configuration? Can you cause the charging icon to come and go by applying slight pressure in different directions on the mini usb plug?