Hi guys...
I recently got into rpi and linux stuff. I set up openmediavault for raspberry pi on my rpi3 and everything worked find until today.
I was playing around with "nmap" when my pi froze. i rebooted it (cut the power) and after that, nothing worked.
i had a backup image file, which i put on the sd card, now everything is back up running, but i randomly have problems signing into the web gui of omv.
i tried everything, even found a thread here on the same problem, but all the steps there didn't help.
do you guys know where to start looking for the problem? 
as someone might ask:
Code
root@raspberrypi:~# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/root 3.2G 1.6G 1.5G 53% /
devtmpfs 483M 0 483M 0% /dev
tmpfs 98M 748K 97M 1% /run
tmpfs 5.0M 0 5.0M 0% /run/lock
tmpfs 195M 0 195M 0% /run/shm
/dev/mmcblk0p1 56M 21M 35M 38% /boot
/dev/mmcblk0p3 12G 3.1M 11G 1% /media/ 5
/dev/sda1 114G 19G 96G 16% /media/ 7
/dev/root 3.2G 1.6G 1.5G 53% /var/folder2ram/var/lib/php5
/dev/root 3.2G 1.6G 1.5G 53% /var/folder2ram/var/log
/dev/root 3.2G 1.6G 1.5G 53% /var/folder2ram/var/lib/monit
/dev/root 3.2G 1.6G 1.5G 53% /var/folder2ram/var/lib/openmediavault/rrd
/dev/root 3.2G 1.6G 1.5G 53% /var/folder2ram/var/spool
/dev/root 3.2G 1.6G 1.5G 53% /var/folder2ram/var/tmp
folder2ram 487M 21M 467M 5% /var/log
folder2ram 487M 8.0K 487M 1% /var/lib/monit
folder2ram 487M 700K 486M 1% /var/spool
folder2ram 487M 0 487M 0% /var/tmp
folder2ram 487M 4.0K 487M 1% /var/lib/php5
folder2ram 487M 444K 487M 1% /var/lib/openmediavault/rrd
/dev/root 3.2G 1.6G 1.5G 53% /var/folder2ram/var/lib/rrdcached
folder2ram 487M 15M 472M 3% /var/lib/rrdcached
thanks in advance..