Were you outside of the 14 day guarantee? I'm having the same problems everyone else is stating ever since 3/8, the day I activated the phone. I'm worried about trying the software update since I've read poor experiences. I've been using a Galaxy device since 2012 (even had to return my Note 7 back then with the battery issue). And now it feels like Samsung isn't really taking much action to help their loyal customers.
I'm on tmobile and I just had my s10+ replaced. My s10+ would drop signal and I couldn't receive or make calls. My data was affected to where I can't access internet nor send and receive text messages. The odd thing is that it just started happening over the weekend (3/22-3/26). And I had the phone for about only 20 days.
Mine started yesterday. My wifi of 866mbps that I usually use to game started giving me an error message that I'm not connected to a wifi when I'm trying to open the game. I thought It was my wifi so I reseted it multiple times and factory reseted it. Still the error message of I'm not connected to a wifi network poped up when I'm opening the game. I then went to school and connected on the fast school wifi and the error message still happened. Now I'm convinced that it's the phone and not the wifi network.