Repeated short jogging runs DM542 into error state

[axxel]

Disclaimer: this is most likely not a grbl issue, but I'm desperate :-/

I noticed that if I do a couple of small jogging moves in quick succession (e.g. 16 steps every 0.5s in a 1600 micro step configuration), the DM542 driver runs into an error state where the red LED blinks 4 times every 3 seconds. I tried with different max current settings and different accelerations and speeds and I tried all 3 motors + drivers. The only way to reliably prevent this is to reduce the frequency of the jogging moves to about 1 every 2 seconds. I can't make any sense of this. It seems the 4x red blinking code means there is an error in the connection between driver and motor but everything works just fine otherwise.

I contacted the manufacture (ACTMotors) but got no response. I would be very grateful if someone has any idea what the issue might be.