Let see about a few things before trying to upgrade. I ran my 655 on v.2.00 for a long time before upgrading.
Possible there is something else:
What gaming do you do? PC or Console.
Review the Gaming, QoS and Gamefuel sticky in this forum.
What ISP Service do you have? Cable or DSL?
What ISP Modem do you have? Stand Alone or built in router?
What ISP Modem make and model do you have?
If this modem has a built in router, it's best to bridge the modem. Having 2 routers on the same line can cause connection problems.Some things to try:
Ensure DNS IP addresses are being filled in under Setup/Internet/Manual? You can find these under Status/Device Info/Wan section.
Turn off Advanced DNS Services if you have this option under Setup/Internet/Manual.
Turn on DNS Relay under Setup/Networking.
Setup DHCP reserved IP addresses for all devices on the router. Setup/Networking
Ensure devices are set to auto obtain an IP address.
Set Firewall settings to Endpoint Independent for TCP and UDP under Advanced/Firewall if you have this option.
Let us know, also review the firmware update sticky too for upgrading firmware.
Maybe someone can review your router settings with you using
teamviewer.