Hi,
Try changing the following keywords (see the manual for details):
$scfdamp start=4.000 step=0.100 min=0.500
$scforbitalshift closedshell=.4
$scfiterlimit 150
If this does not help, just increase the damping (and perhaps the shift, too):
$scfdamp start=8.500 step=0.200 min=0.500
$scforbitalshift closedshell=.5
$scfiterlimit 200
For closed-shell systems, use automatic $scforbitalshift instead of closedshell.
These keywords are usually the most straightforward way of reaching convergence. Fermi-smearing can also be very helpful, especially when used with the "nue" option (see manual for $fermi)
Regards,
Antti