The game has been very unstable for about two days now. Thursday night had lag so bad it was unplayable. Wifi or LTE was the same.
Video retains have been crashing the game for a day now and I've also had three random crashes during battles, including just now which cost me my top generals for 24 hours but worst of all, my mercenaries are gone.
I only use my mercenaries when I have video or VIP retrains available since they're tanks I received from the daily video rewards. I've messaged support but yes, there's definitely an issue or two.