I've had trouble with DCC locos stopping and taking a while to get restarted form time to time, usually over points and the like. Note that there are no capacitors across the motors here, which I know cause trouble for DCC.
From reading around it seems likely that the root cause is the line voltage to the chip dropping momentarily, and I have seen some comments to the effect that this can be fixed by the addition of an appropriate capacitor (presumably with a resistor) to keep the chip powered during very short transient power loss, from dirty track, points and the like.
Has anyone done this? What values are appropriate and on which lines would one apply the fix? Presumably the red/black. Also, what type of capacitor should one use?