I'll save you some laborious admin, he cost us points against Chelsea last year following an error. Against city last year he made an error that leads to a goal, but that wasn't why we lost. Many, probably you too, will point to the Barca game, I don't but fair enough if you do (I point the finger at Frodo) but that moment didn't cost us the game, just as his sending off against PSV result in them scoring. But even if you want to include those two games on the list that's three games we lost from errors, from 254 games!!!
As I say it's recency confirmation bias.