Are you able to re-connect always when using the "Repair connection" procedure or do you have to reboot also after being unsuccessful?
In this case you may want to check for a heat problem in the Samsung.
Since you have no history with this machine, can you try this on a different network at a different location?
Is it possible that your router kicks you out as you may have reached the max possible connections via W-LAN (4 at a time???)?