There is no smartphone that is not free of problems. Everyone has some detail to a greater or lesser extent. In this the users report problems with the SMS in the Galaxy S8 and S8 +.
Some of these texts disappear regardless of the telephone operator hired (Verizon, AT & T, T-Mobile and Sprint). It is not known if they are deleted or they are not received. This happens in the United States at the moment, without the company having disclosed the reason or any statement (in Mexico it seems that everything is fine in the test I did).
Hopefully with the help of an update is resolved and that it is only a problem in that region, although for now, few people tend to use this type of service. The most worrying thing is that it is not the only app with that failure, since even the message app of Samsung, Android and even Textra has that error ... It is recommended to disable the messages advancing in the settings although it does not always work.