Just saw this over on Sprint Community on a big thread about the network issue:
"As always, Sprint and Samsung continue to closely monitor concerns about intermittent or total loss of voice or data with the Samsung Galaxy S10, S10+, and S10e handsets. There will be a software release available on Tuesday, April 16th that will prevent the device from experiencing intermittent voice or data. Please update as soon as this release becomes available."
https://community.sprint.com/t5/Samsung/Galaxy-S10-10-10e-Perma-Roaming-The-Sequel/td-p/1039070