Had the same problem today. But after filesystem check SX80 had rebooting in a loop.Tryed to access the CLI via serial (115200, N, 8, 1) with follows: <---skip--->
Checking file system
fsck 1.42.10 (18-May-2014)
e2fsck 1.42.10 (18-May-2014)
/dev/sda1...