iPhone 15 Pro keeps dropping wifi - sh.itjust.works

I upgraded from a 13 Pro to a 15 Pro. So far the only internet I’ve connected to since I got the phone is at home, but 2 different networks (one is 5g but otherwise same router and everything). I never updated the 13 to iOS 17 because I knew I would be upgrading soon, but I never had this issue with any former phone and have been on this same internet setup since 2016. I have an iPad Mini 6 that I did update to iOS 17, and it’s fine. I’ve tried resetting network settings, turning off Wi-Fi assist, restarting multiple times, etc, but it still randomly drops my WiFi signal on both home networks. Everything else wrt network/connection on my previous phone is the same - VPN setup, etc. My SO has a 14 pro & did update to 17 and does not have this problem. Does anyone have any ideas? I’ve searched for answers and I see that this has been an issue off and on for the past few years, but one of the fixes I mentioned above usually seems to help I guess because I haven’t seen any other suggestions. Could it be the phone itself? Is it worth exchanging it for another one before the 2 weeks runs out? Thanks everyone.