Aside from the lack of sound scapes, not a bad map.

The map is updated. Please check if the disconnection is resolved or not.

I did not have that addon.

Have you subscribed to 'Simplest Subtitles Framework' add-on? I also had same issue, and 'Simplest Subtitles Framework' was the cause of the issue.

The only thing that come to my mind is, the map 'plays' lot of sound at once, and 'Simplest Subtitles Framework' try to create subtitle for every explosion sound, thus overflowing channel.

I haven't decided to remove some of them or not, because the mapper might put those sounds intentionally.

This issue can be avoided if you avoid getting the explosive barrels to burn or explode.

When I get to the underpass with the barrels, when they explode, the game freezes, then gives me a message that says "Client 0 Overflowed Reliable Channel", then sent me back to the main menu. It's not a CTD, but it did overflowed the server (even though I was doing it in singleplayer) and kicked me back to the main menu.