Is the router overheating? It could be. Years ago, I had the same problem and found out I needed to put a actual fan directed at the router. It cured the problem immediately. Hope it helps you guys! Thank you for all you do for all of us. Also make sure you are not maxing out the users on this router, it could max out if additional users (more than the requirements can handle). That leaves you connected with no connection (shows you on but can't handle the additional PC). If this doesn't help email me!
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Here's the specs of your router.
D-Link DI-808HV CABLE/DSL VPN ROUTER W/8-PT SW
D-Link DI-808HV, Cable/DSL VPN Router with 8-Port 10/100Mbps Integrated Switch. MODEL: DI-808HV VENDOR: D-LINK FEATURES: Express EtherNetwork VPN Router 8-port Broadband VPN Router The DI-808HV is an 8-port Ethernet Broadband Router with VPN (Virtual Private Network) capabilities. The VPN feature allows users to securely connect multiple computers over the Internet via IPSec, PPTP, or L2TP tunnels. The DI-808HV also supports VPN pass- through for those who want to use their own VPN client softwares. It also features 10/100Mbps Auto MDIX/ MDIX Ethernet ports allowing CAT 5 cable (straight-through or cross-over) to work with the DI-808HV. The DI-808HV is an ideal solution for users needing to access corporate networks or a remote VPN (server/client). With its protective VPN security features, users can have access to corporate network as if they were in the office. The DI-808HV includes a new, easy-to-use D-Link web-based graphical user interface (GUI) to configure the router. To prevent unwanted Internet intruders from accessing your private network, the DI-808HV also serves as a feature-rich firewall. Along with its firewall features, administrators can easily configure the network to prevent certain web sites containing explicit material to be accessed. With the growing number of telecommuters wan internet security devices articles and remote branch offices needing to share wan internet security devices articles and exchange corporate data, all users will have the capability to do so with the DI-808HV. Whether you are an executive working at home or a company representative in a remote office, the D-Link Express EtherNetwork DI-808HV is the networking solution for you. SPECIFICATIONS: STANDARDs - IEEE 802.3 10Base-T Ethernet IEEE 802.3u 100Base-TX Fast Ethernet IEEE 802.3x Flow Control ANSI/IEEE 802.3 NWay Auto-Negotiation CONNECTORs- LAN: (8) 10BaseT/100BaseTX/RJ45 ports, auto-negotiation Auto-crossover cable adaptation WAN: (1) 10BaseT/100BaseTX/RJ45 port, auto-negotiation Auto-crossover cable adaptation (1) male DB-9 com port DEVICE MANAGEMENT SECURITY- Denial of Service (DoS) Stateful Packet Inspection (SPI) Activities Logging NAT DMZ Filtering VPN SUPPORT- IPSec (40 IPSec Tunnels) IP Authentication Header (AH) IP Encapsulating Security Payload (ESP) Internet Key Exchange (IKE) authentication wan internet security devices articles and Key Management Authentication (MD5 / SHA-1) NULL/DES/3DES Encryption Algorithm wan internet security devices articles and their use with IPSec Internet Security Association wan internet security devices articles and Key Management Protocol Main wan internet security devices articles and Aggressive mode INDICATORS- LED's for Power, M1 (Indicates Active System), M2 (Indicates Internet Connection), COM (for dial-up modem), (1) WAN Link/Activity (