Quite strange. There may be a problem with the device...or who knows...
If this happens and if you turn off the device, then turn it on again?

You can try with some other iGO. Try for example with [Only registered and activated users can see links. ]. Just use software and accompanying files (langs and voices). Rename main exe to iGO8, put in same folder...
If there are still problems, it may be up to the device itself.