I’m not too familiar with the design of the microdrivers–I just bought them and used them (via the SPI instead of the CAN interface). But based on my experience debugging it, I had the red LEDs come on during early testing whenever my power supply could not supply the required current when moving motors. It then enters a fault state with the red LED and noisy motors, which can be exited by pressing a physical reset button on the board. There are some other threads in this forum describing this behaviour, for example here: Motors stop working after a fast movement - #2 by fgrimminger
I’m hoping someone more familiar with the hardware/firmware of the micro driver can confirm/follow up!
Best,
Yuni