Arsenal hero Nigel Winterburn feels the tiny details are costing Mikel Arteta's team - though remains confident of their title challenge.
Defeat at home to Manchester City in midweek saw the Gunners surrender to City the Premier League leadership on goal difference.
On behalf OLBG, Winterburn told Tribalfootball.com that individual errors have cost Arsenal in recent weeks: "I believe it's still in Arsenal's hands, but I said at the start of the season I was enjoying what I was seeing from this Arsenal team.
"I was worried about the squad depth, and you're always worried throughout a season about injuries to key players.
"You're also worried that there could be a drop off in form and when you get two or three players dropping off in form, then the performance level drops overall.
"It could be less than 10%, but you give teams a chance to take something from you.
"Unfortunately, over the past couple of weeks that's happened to Arsenal.
"We can dispute the Brentford goal which should have been ruled out but wasn't.
"But I think there's been a feeling from the Everton and Brentford games that there's been a slight drop in form.
"Although the performance against Manchester City was decent, the key moments cost Arsenal. What Arsenal need to do is not as huge as people think, yes, they've let Manchester City back in and probably Manchester United as well.
"But Arsenal just need to regroup and go again, show people that this is a new Arsenal.
"This is what I'm looking forward to seeing from this group, I'm confident in the team because they've made huge strides since last season.
"They've just got to come again and show everyone why they've been spoken about so strongly. This is going to be their biggest test so far now that Manchester City have taken over top spot. Arsenal have that game in hand, but we're going to see a lot about the characters of these players and how much faith Mikel Arteta has in his squad.
"Arteta has plenty of belief, there's no doubt about that, but they've just got to come again."
The Gunners face Aston Villa in the early kickoff today and Winterburn, a title winner with Arsenal, believes Arteta will urge his defensive players to play the percentages.
He explained, "What they will be doing is analysing the game, but what we've seen from Mikel Arteta is his pride in his players.
"We saw that after the Everton game, the level of performances achieved so far by Arsenal are remarkable.
"He just needs his players to go again, show them the aspects of the game where Arsenal were good and created chances and then show them the times where maybe the team rushed things a little bit.
"Defensively they'll look at things and give his feedback on those moments where they got things wrong. Given the situation he may have preferred if his players just knocked the ball out or maybe clipped it away.
"Defending is about risk assessment, no matter how you play or how you're told to play, when you're out on the pitch you're the man in charge. You have to be big enough and brave enough to make those decisions and you can always discuss with the manager afterwards.
"If you feel like you need to just clear the danger, then you do it and deal with the consequences afterwards. The issue the manager might have is you had time to bring it down and play the ball out from the back again.
"There were moments where Arsenal came under pressure and Tomiyasu looked particularly uncomfortable.
"Let's not forget how good Manchester City's movement is as well, they just got caught out a couple of times.
"Those are the things Arteta will look at individually and collectively, especially at the back where Arsenal need to be better."