Allochthon

My guns are ceasing to work mid-fight. They're repaired, I have plenty of ammo, I'm reloading. Is there an 'overheat' mechanism that I am unaware of? Or is this a bug? Specifically, the Light Assault Mk 2 guns. I carry two, one with physical damage, one with plasma. They have Mag-num and generally Extend-O-Sight installed. As you can imagine, this has killed me more than once. I've had to go into my inventory to find working guns a few times.

I, too, had this issue. PS4.