New iphone 17 pro max sluggish, can't open load certain apps, won't download apps.

My wife's iphone 11 pro max was having issues launching certain apps (on and off wifi). and was incredibly sluggish. I upgraded to a 17 pro max and still have the same issues. Specifically netflix, venmo, and walmart. Now I cannot even download apps from the app store. I have verified my apple id is signed in and payment methods are correct. checked date and time settings, checked DNS config, made sure no VPNs were active, restarted phone, reset network and all settings, tried downloading on Data, home wifi, and other wifi connections and still no fix. Iphone has plenty of storage (500+gb) but is still incredibly sluggish. I've found other iphone users having a similar issue to me but no one has found a solution. Please HELP!!!