Poor 5G Reception on Brax 3

Has anyone experienced poor 5G reception on the Brax3? In places where I got good a 5G connection on my old phone, I get weak or no 5G connection at all on the Brax3. I have had to switch the “preferred network type” to LTE which is of course less-than-ideal. Carrier is T-Mobile, but this doesn’t appear to be a carrier-related issue.