DHCP not releasing IPv4 addresses

[wireless]

This has been happening every week recently where my router's DHCP will stop releasing IPv4 addresses. The only way to fix this is by restarting my router, but the same thing will happen again about a week later. I receive an IPv6 address from the router only, but that does not allow me to access many websites. For some reason, I can still access Google, Facebook and Youtube. But I lose access to all other sites whenever this happens. This also happens to multiple devices in my house hold. Can anyone help me out?

Steps I have tried:
- Reseting the router
- Restarting the router
- ipconfig /release and /renew


More... (https://forum.telus.com/t5/Internet-TV-Home-Phone/DHCP-not-releasing-IPv4-addresses/m-p/91315#M18976)