The router services that may be affected by MAC address randomization include:
- Mac filtering: the allow/block list
- DHCP: the reservation of IP addresses
- Traffic control
- Safe Access: users profiles
- Threat Prevention: the exception list for packet filtering
What you could do specifically for that router/connection in your home is:
SETTINGS>NETWORK AND INTERNET>INTERNET>SELECT THE COG FOR YOUR WIFI NETWORK>PRIVACY
Change the MAC Randomisation to Per Network from Per Connection and if that doesn't work select Use Device MAC this should resolve your issue while still leaving you protected for other networks.