My guess for the reason of our problem is cross matching.
Betfair earns additional money with cross matching, and it so it is comprehensible to run as many markets with cross matching as possible. As the math behind cross matching is complecated and needs more CPU power on Betfair's servers, auto-dutching adds big amount of CPU usage to the servers if cross matching is enabled.
Betfair checks accounts with many bets below the limit for fraudulent activity. Some month ago, Betfair has checked my account, but there was no frautulend activity, approximately 15% of my bets are below minimum because of limited liability and lay bets at high odds.
I changed some parameters of my triggers to cope the latest API problems.
Greenout parameters are now less exact, now trigger considers greenout completed, if P/L difference of all selections is at most 2 (and not 0,1 as before) .
Liability is increased, 2 or 3 times as before, but activity is limited to markets where I expect big profit.
With these to actions, the number of bets below minimum are very small, I had no problem with a flood of "bad" bets since saturday.
Maybe Betfair does not respond your support request, because they are not sure if they should limit cross matching to dedicated markets..........................