Squad infils randomly switches off

I love this game, but this makes me need a break. Loading up a match of trios comes with a random chance of being loaded in alone. Exhausting, frustrating, and nauseating. There's normally warnings about any difficulty spikes, such as neglecting ammo, heals, or the pop up when selecting rook. Those are greatly appreciated, but why the lack of warning when going alone into trios? I suppose it'd be unneeded if the settings did not radomly switch around. Please fix or add a warning. Thank you.