Yeah, if Wendy’s worked maybe because it was an Open (unsecure) connection. Your security protocol on the “new” laptop may not be jiving with the router.
Lastly I also intermittently get the IP address conflict box.
Didn’t see this. Set your IP router address to static (put in the numbers yourself). You have another device with the same IP address you’re trying to use. This is the conflict. The router is not handing out IP addresses correctly.
Use for DNS 8.8.8.8 and 8.8.4.4