I am accessing via Steam.
I didn't have this problem earlier this morning (USA Eastern Time).
My problems began after lunch time.
The first problems was at the start of depth 19 (Coral Gate). I lost connection in game (jellies disappeared and charge attacks became unresponsive).
Then I was disconnected from the server.
Attempts to re-connect failed, so I waited an hour.
Now after sucessfully logging on and in the ready room, using the "Missions" tab to access the arcade and onto Coral Gate,