iPhone not always unlocking our TESLA via the Tesla App.

We haven't been able to resolve this intermittanr problem in over 1 year. Access to our 2034 Tesla model 3 is sometimes not allowing access from my partner's iPhone SE3. We followed the steps Telsa suggested, Bluetooth, internet, re-boot, etc. then disconnected her phone, and went through inviting her again. This appeared to clear up the problem however today it's failing again, and there's been Tesla update (which we suspected was causing this to occur). My (main) iPhone 15 works flawlessly.

Has any other iPhone/ Tesla owner experience this intermittent issue?