[Nirvash]

From http://www.ti.com/lit/ug/spmu131a/spmu131a.pdf

A slow flashing Red LED indicates that the MDL-BDC24 detected one of the following fault
conditions:
„ Power supply under-voltage
„ Over temperature
„ Over current
„ Limit switch activated in the current direction of motion
When a fault condition occurs, the motor shuts down and the LED indicates a fault state during the
fault condition and for 3 seconds after the fault cause is cleared (except for the limit switch fault, which is cleared instantly). A slow flashing Yellow LED indicates that the MDL-BDC24 is not
receiving a valid control signal.

So, it may have shutdown due to over temperature.