Hi @Brian4 just last month someone wrote about how a flakey Tslim USB connector was causing the software update to fail so it isn’t common but the port can go bad. New software update for Tandem T:slim pump - #68 by Patticakes You are on the right track to get the pump replaced by calling Tandem and trying their new USB cable first.
Out of curiosity, why go with the Tslim instead of the Mobi? Are you coming from a 780G? Was it the pump that gave you trouble or their CGM?