If your constantly losing 5G/LTE signal in your area and have tried Airplane Mode On/OFF several times, then we recommend you contact T-Mobile customer service to check if there are any changes with the cell tower near your area or other factors causing the drop in data.
However, if the issue persists after consulting with TMO, then please don't hesitate to submit an error report via Samsung Members.
I'm having this issue too, I'm on Mint mobile and had not had this issue until after I completed the update. Another minor beta 4 update came out the other day and I did that. It helped a little bit but I'm still having drops often. I normally have to restart my phone to get it to come back.
