Richard Keys has claimed that Arsenal have made a big mistake in recent weeks which nobody is talking about. Mikel Arteta’s side suffered their first Premier League defeat since the turn of the year on Sunday. Aston Villa ended Arsenal’s run of 10 wins from their last 11 games with a 2-0 victory at the Emirates Stadium. The result leaves the Gunners two points off the pace in the race for the title, with Pep Guardiola’s men out in front. Manchester City are renowned for strong finishes to the season and following Sunday’s results, Liverpool and Arsenal will likely have to be flawless for the l…