@webadmin 

"Also, clicking some sites like a wiki site spin for like a minute, then load fine."

This may indicate a DNS configuration issue.

  @webadmin 

Hi. Are you setting up anything like DNS to your WAN or LAN(DHCP)?

Please make sure that your WAN DNS is not manually set to a local IP address which is definitely causing issues like unable to access some websites.

If you have set up your own DNS server, please make sure that is set to DNS under DHCP. At the same time, make sure the DNS set up by yourself is working properly and not blocking some sites. There are some ad-blocking DNS servers like pi-hole. Please check if you have such DNS servers or not.

By default settings, (the firewall rules/routing on the)router will not actively block your app/services/internet access.

BTW, do you have any other configurations set? Like ACL, block certain services or ports?

Is your modem router working properly? Are you able to connect to it and receive text messages?

  @webadmin 

You need to describe your setup, i.e. connections between your ISP modem, router and WiFi AP. What's your AP and how did you set it up? Also, can you run a ping test on those WiFi devices you have problems with? One with an IP address and one with a DNS name.