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[mandai]

The specific details on how to fix this would depend on how your router is configured.
Your router's instruction manual should show how to check address reservations and DHCP ranges.

[Usman55]

Can you go into some more detail? My router is Thomson tg585 v7 and I haven't seen many topics about it so it's a rare router, not many have it. But where I live, it's the most common.

[mandai]

Thomson routers are quite common actually as most ISPs give them away as part of the package.
Generally these routers don't use any kind of address reservation by default so that can be ruled out.

Are all the devices on your network using DHCP to get their addresses?

[Usman55]

I haven't even heard the word DHCP, but I think I 'saw' it in the router's page somewhere which I don't remember. I think you'll be able to help me out better if you come over TeamViewer. I'm available for 4-5 hours starting from the time I'm posting this post.

[mandai]

I'd advise against trying to alter network settings remotely, as it would be difficult to reconnect if there was a problem.

[Usman55]

I didn't even think of that, so what's your advice?

[mandai]

My advice would be to reboot the router and make sure the IP address settings are on automatic for all machines.
If that doesn't work then you could try a different router.

[Usman55]

I tried rebooting and it worked. But after a few hours it started that again. I guess I'll try that again.