https://wccftech.com/sprint-rolling-out-fix-for-galaxy-s10-reception-issues-some-galaxy-s8-and-note-8-units-also-affected/

People who own Galaxy S10 series smartphones have been experiencing major cellular reception problems for the past few weeks. Even the 5G variant of the device ran into troubles during its test run. Users managed to fix the problem temporarily, but today, Sprint has issued an official fix. According to Sprint’s website:

The software update bears version ASC8 should fix these issues for most users who have had to deal with degraded network service. If you’re still experiencing poor network performance after installing the update, Sprint recommends that you get a replacement for your device. One would expect that an OTA update would be enough to fix what appears to be mostly a software issue, but the problem appears to be deeper than that.