Dropped Game, Lost Commendation Progress

Was playing a round of Warzone just now. Needed three more Spartan Laser kills to complete the commendation path. Got four kills with a Splaser. Suddenly, other players and vehicles stopped moving. I moved around, I shot at them, but nothing happened. Then, the screen went black, I found myself in a loading screen and then back at the menu. My Splaser kills, gone. My Splaser Commendation pack, NOT THERE. The Spartan Laser REQ card I spent to call the Splaser in - GONE.

What the hell happened to me?

Has it happened to anyone else?

And most importantly: If I can’t do it in Warzone, where else can I get Splaser kills?