Gen2 Dataflow failures when loading medium sized datasets

So have been doing some more testing (things magically started working again last week) and am starting to think there might be a max # of times per [time period] that I can load data to the warehouse. I tried with a dataset with 85000 rows and got a failure--host closed the connection--but then tried an hour later and it worked. When I hit the 85000 mark, I'd been gradually ramping up from 1000, so 4-5 runs in the space of under an hour. Still testing to see if this is the real issue, but would be great if someone from Microsoft could let me know whether there is indeed some kind of throttling going on that prevents repreated loads into the same table...