Dropped connection every 12 hours

Every day at 11:50 am and pm i lose my connection.  I have looked at my router (Apple Airport Extreme) and I see nothing about the DHCP that could cause it.  Only manual options I have are  renew DHCP lease and no matter what time I hit that it doesn't affect the loss at 11:50, and manually setting the DNS servers which are 68.105.28.11, and 68.105.29.11.  Could someone take a look at my modem and see what might be happening?