Defensive Fire unit quantity

[5 Leichte Div]

Hello, All.

This query may have come up before.
Unlimited defensive fire - is there any limit for how often a unit may
do defensive firing in the same game segment ?

I was tinkering solo , and saw an SS Wespe unit fire 9x responding to 
the British shooting during a busy firing segment.

This was the most that I've seen a unit do this kind of activity.
Typically - units would fire 2 to 5 times in DF mode.

  Normandy - Scn. - #0607_ 02  12 S.S. Riposte 

Does a unit's Morale and/or its Disruption status affect how often it might DF ?
Supply Status ? Or just the random possibilities at play ?

Just curious - Panzer Battles is a very nuanced game system.
A Great Game !

Thank You, Sir    
5 Leichte Div