So the same situation keeps happening to me, and I don't know why.
I am attacking the tatooine weapons factory in a squad war.
During the attack, I get an Error: Command Failed! The server was unable to execute the command. Please reload and try again. If the problem continues, please contact customer support. Status: 1215
So I don't think this a hardware problem, because I have never gotten this message outside a squad war and actually outside attacking tatooine.
Also, I am using a shadow rancor during the attack (with regen buff ftw) among other units, and during the battle my screen freezes with that error message. I have usually dropped a few units by then, commonly the rancor, an eATAT, a shock trooper, and some other troops. I also cleared all units from my build queue before the last time this happened before starting the attack.
I lose the attack from the squad war, and actually last time this happened I won a star despite dropping only two units, but never got credit for either the win or kept my attack.
Has this happened to anyone else?