Windows 8 Windows 8.1 keep creating new Network Stacks...?

It sounds like you were dealing with network profile name duplications on your Windows system, specifically with "Network," "Network1," "Network2," and "Network3" profiles appearing. The fact that your cable router was behaving oddly and rebooting itself could have triggered Windows to create new network profiles due to changes in network identification.
Your approach to modifying the network profiles in the Windows Registry and renaming profiles is a common way to address duplicate or unwanted network profiles. When dealing with issues like these, it's essential to be cautious while modifying the Windows Registry to prevent accidental changes that could potentially harm the system.
If you've successfully resolved the issue by renaming and deleting the old network profiles and ensuring that the network configuration reflects the desired setup correctly, you should be fine. Moving forward, monitoring network profile changes and ensuring the network connections are stable and correctly identified will help prevent similar issues in the future.
If you encounter any recurrence of network profile duplication or similar network-related issues, further troubleshooting steps such as verifying router stability, updating network drivers, and checking network settings in Windows can help maintain a stable and reliable network environment on your system.