Acquire Network Address No DNS Suffix

For awhile every now and then my computer decides it needs to 'acquire network address' on booting up. It never does succeed unless prompted by my going into Wireless Connections and pressing 'repair'. Yet my connection to the Internet is not impeded even while the little yellow ball hovers round mini monitor in the taskbar. It is hovering now as this thread is written. ipconfig reveals Connection Specific DNS suffix is missing, but the IP Address is there. My ZyXel 7087 router shows a fixed W/LAN/WPS and DSL light, but the Internet light is continually flickering, regardless of whether the computer is on. The TCP/IP is set to,'Obtain an IP address automatically' and 'Obtain DNS server address automatically'. Advanced TCP/IP Settings shows DHCP Enabled. DNS tab - DNS server addresses box is blank 'Append primary and connection specific DNS suffixes' is dotted and 'Append parent suffixes of the primary suffix' is ticked. 'Append these DNS suffixes (in order)' is unchecked. WINS addresses box is blank. 'Enable LMHOSTS lookup' is ticked. NetBIOS setting - Default (checked) - Use NetBIOS setting from the DHCP server. If static IP address is used or the DHCP server does not provide NetBIOS setting enable NetBIOS over TCP/IP. Enable & Disable NetBIOS over TCP/IP unchecked. While reading the WNC status the computer has found the Network address, but all above remains true.