Hi @ace04 

In your description, the question is very blurry and unrelated. Can you please speak your question again in a more concise and clearer way?

BTW, you did a wrong test in the picture. Google.com should be tested on Interface = WAN. Not LAN. As the DNS can resolve the google.com, I can tell that DNS and Internet should be both working.

Hi @ace04

1. What are the IP addresses of your WANs? They should not be the same subnet if you don't have public IPv4 addresses.

2. Since you've turned your wireless router into AP mode, then you don't need to worry about any NAT issue now. Then when you experience unstable internet, does this happen to wireless devices only? Are your devices close enough to the AP while experiencing the issue?

3. What about your wired connection? Run CMD and run a continuous ping to two IPs.

a. ping 8.8.8.8 -t 

b. ping default_gateway_IP -t

If your wired connection's fine, then you should consider if the cable to the AP is bad/faulty, or the clients are not getting a good signal and causing a packet loss, which eventually leads to problems with your internet connection.