Hi Furrywombat,
I had a look at our logs and I am seeing a large volume of calls to the MethodAPIActionSendToDesktopV2 endpoint using non-existent recordIDs which are resulting in exceptions to be retuned. These calls are being made for the Sales Order, Invoice and Customer tables. In some cases, I can see that the calls are being made for the Customer table using a recordID = 0.
The calls to the MethodAPIActionSendToDesktopV2 endpoint for the Sales Order & Invoice tables are continuing to be made this morning on a very frequent occurrence in duplicate fashion (It appears that two users are making the exact same calls).
I suggest revisiting the code on your side to determine where these calls are originating and correcting the problem. Eliminating these errors will allow us to see if this is the source of your problem, and if not, we can then dig deeper.