What should I enter as my gateway and DNS 1 in my Galaxy S7's Wi-Fi settings to fix the particular Wi-Fi issue I'm having?

I was following this user's advice on how to fix the internet may not be available issue on my Galaxy S7. He said that in the Galaxy S7's Wi-Fi settings for the network you're connected to, you should change the IP address to static and then enter your router's IP address where it says "gateway" as well as where it says "DNS 1". What confused me about this a bit was that I use a Wi-Fi mesh setup in which my phone should actually connect to the router I'm using as a repeater, since it's more nearby, rather than the one that's the master. So I was wondering which of those I should enter and if it makes a difference. To describe the issue further: My Galaxy S7 sometimes just doesn't have internet, for hours on end, and upon checking, I once noticed it displayed the error "internet may not be available" with an exclamation mark next to its wifi symbol. This wasn't an issue until recently, despite not really having changed anything about my setup. I can temporarily resolve the issue by rebooting my S7. Another thing to take note of is that I don't use the S7 in a normal way. Instead, it's just permanently plugged into an AC adaptor and is supposed to act as a smart home-controlled alarm clock and mirror calendar notifications onto my other devices. To resolve the issue, I already unsuccessfully tried a bunch of troubleshooting steps that some website suggests: - Rebooting my router - Checking proxy is turned off and DCIHP is turned on - Deleting the network off my S7 and re-adding it - Uninstalling VPN apps - Making sure router and phone have the latest software Running Android 8, btw. My local network environment is just a normal home network with like a dozen devices with a mesh. I'm using two FritzBox 7490s. One is the master, and the other is the slave. The two are one floor apart from each other, and each covers a 70m² apartment. My S7 typically displays 3 out of 4 bars for Wi-Fi.