I downloaded the latest update for my Samsung Galaxy S8 last Friday and I've had absolutely no LTE ever since. My phone only picks up either 3G, just bars, or absolutely nothing. I live in Las Vegas, NV and I've had LTE virtually everywhere beforehand for years. This isn't some tower issue either - in addition to traveling all over the city with this problem present, I'm currently in Anaheim, CA and I'm still stuck with spotty 3G coverage. I've done ##SCRTN#, ##UPDATE#, and ##26327#, as well as manually updating profiles and PRL. Some of these solutions have had the LTE pop up, but it's with the exclamation mark indicating no data is being transferred, and it goes back to no signal a few seconds later. As I'm currently not in my own state, I'm concerned about having an issue here and not being able to contact someone at home because of poor service. Any help is appreciated.
I can understand why you're concerned. Let's see what we can do. Have you tried to update the data profile?
Also I see the current version of the software is G950USQU4CRH1. Is that what you have?
is the problem affecting data only or both voice and data?