It's because they're so unfit. They're dead on their feet 5 minutes into the second half. Every game. All of them
Who could have foreseen this? I mean, it's never happened before. And certainly not in the last 4 games.
And the options to replace them are crap. If football matches were 60 mins long we'd be fine. But they're 90 mins long and our lack of fitness and depth has relegated us.