Who I have the same questioned this topic

My Galaxy S8 was doing the same thing.  Was due for an upgrade and got a brand new S10+. Message+ app saying messages are sending and they actually send sometimes and other times don't.  I have messages that all pop in at once also.  I am also getting disconnects during conversations on Wireless everywhere I go.  Please help.  Called Verizon customer service they text messaged me and said I wasn't set up for texting.  Still happening.  Ugh.. driving me crazy!!!