ferdi,
do you have windows 10 devices in your network?
can you share your network topology?
further looking into syslog - Sep 20 04:24:45 IC_ENERJI mDNSResponder: mDNSPlatformSendUDP got error 99 (Cannot assign requested address) sending packet to FF02:0000:0000:0000:0000:0000:0000:00FB on interface FE80:0000:0000:0000:F2B0:52FF:FE04:42C0/uif0/202
Sep 20 04:24:46 IC_ENERJI mDNSResponder: mDNSPlatformSendUDP got error 22 (Invalid argument) sending packet to FF02:0000:0000:0000:0000:0000:0000:00FB on interface FE80:0000:0000:0000:F2B0:52FF:FE04:42C0/uif0/202
pls chk this and apply the solution here...
https://forums.ruckuswireless.com/ruckuswireless/topics/windows-10-mdns-and-broken-wireless-network?...