Thank you for your feedback. Network connectivity issues will most likely be resolved more effectively by contacting your carrier directly. If issues, persist, however, please send us an error report to help us debug the issue. Please also keep an eye out for any other issues you may encounter. We apologize for the inconvenience and appreciate your contribution to the beta program.
One UI Beta Team.
Software: US OneUI 3.0 Beta 2 (Build RP1A.200720.012.G981U1EU1ZTJG).
Carrier: Mint Mobile (T-Mobile US MVNO).
Here is what I noticed.
When I am driving, I use Android Auto and when I used Beta 1, for the most part I saw a 5G icon (where 5G is available) on the phone and on the display on the AA.
Now, after Beta 2 update, when the phone's screen is on, then the 5G icon is on the AA display as well as the phone. Once the display goes into a screen saver mode/goes dark (while the phone is still working) the AA display goes from 5G to LTE. As soon as I wake up the phone, back to the 5G.
This behavior is new and I did not see it in Beta 1.
I believe that some kind power and/or data saver is being more aggressive than in Beta 1. Once the screen times out, the phone drops into LTE. Once I unlock the screen, the phone goes back to 5G.