Stamina low from start

I had a problem with one game. My stamina was very low even if don't press . I didn't change anything in the tactics, by at half time the stamina was almost 0. It never happened. Apparently the other team was fine. I subs few players but after few mins of games the ne players were tired as well. Again. No pressing no weird tactics..... Played as usual ....... The game after was completely fine