Just a follow up, and hopefully I don't jinx it, but I haven't had a disconnect since turning off 5G. Sucks that I can't use 5G, but it's better than all the disconnecting.
Having the same problem. I just switched from Verizon to T-Mobile last month because I was eligible for an upgrade at work, but Verizon did not have the Galaxy S21 in stock. I never had this problem with my S10 on Verizon. If I leave the house and I assume am jumping from tower to tower or 4G to 5G, I pretty much always have to go into and out of airplane mode at least once to get a connection back. This is when I am showing 4 or 5 bars. I’ve even seen it act weird showing 5G and no bars (gray x), but have a connection. Pretty annoying to be sure. I just turned off 5G in the settings to see what happens, but a fix would be a lot nicer.
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