Default gateway changing to one belonging to internet provider

[oldkingdragonslayer]

I recently change internet providers and am using a Arris SB6141 modem with a Netgear R7500 AC2350 router.

It seems that my desktop which is hardwired to the router is sometimes bypassing the router and going to a default gateway access owned by the internet provider, thus not allowing me to access other things on my network such as my chrome cast. The routers WiFi is still working fine and I can access the router through my phone. This problem is only solved when I reset both the router and modem. 

My question is why is this happening and is there a solution rather than resetting my router and modem every time.

Thanks

[brwainer]

27 minutes ago, oldkingdragonslayer said:

I recently change internet providers and am using a Arris SB6141 modem with a Netgear R7500 AC2350 router.

It seems that my desktop which is hardwired to the router is sometimes bypassing the router and going to a default gateway access owned by the internet provider, thus not allowing me to access other things on my network such as my chrome cast. The routers WiFi is still working fine and I can access the router through my phone. This problem is only solved when I reset both the router and modem. 

My question is why is this happening and is there a solution rather than resetting my router and modem every time.

Thanks

The default gateway is set via DHCP, and is provided along with your IP address (addresses for DNS server(s) are also provided). If your default gateway is changing, either you have software on your computer that is setting it, or there is a second DHCP server on your network, or there is an issue with your router.

[paddy-stone]

OK, forgive me if you've already tried these, but have you tried:-

 

1. Try a different port on the router for your computer connection. Some routers have a port that's pre-set to be for IPTV... I know this for sure on my netgear d7000.
2. Set up a static IP address.
3. Disable the adaptor and set up a new connection to the internet.