This wait type is never indicative of a problem with SQL Server, and the vast majority of the time it is nothing to do with the network either (it’s very common to see advice stating that this is a network issue). A simple test for network issues is to test the ping time between ...
SOMETIMES there is no problem and the update stored proc runs and updates the column in the table but SOMETIMES the update stored proc does not run and eventually the Timeout Expired error happens in the web app’s C# CATCH...
The client code is doing what is known as RBAR (Row-By-Agonizing-Row), where only one row at a time is pulled from the results and processed, instead of caching all the results and then immediately replying to SQL Server and proceeding to process the cached rows. The client code is run...