Manchester United team is 10th in the points table. The team is not performing very well. It is important for Manchester United to stay inside the 5th place in the points table so that the team can create a chance to achieve something good.
It really looks unrealistic to see Manchester United to stay at 5th position when they currently only have mediocre players and it's still long to go the transfer window will reopen. Manchester United just need to make sure they will not follow Chelsea's path, I think they're still on a way to become Chelsea 2.0 where they lose against mediocre clubs.
Their next match against Sheffield United, will they lose again?

I am not sure what is wrong with them but they need someone to step up. Last season it was Rashford but this season everyone is off the mark. It's the same team like last season but it seems to be that they have lost their confidence and that is why they are beginning to lose their form. Ten Haag again has lot to do like when he joined the team and brought down the changes.
Blades doesn't seems like a tough opponent but the form United are in right now makes it doubtful for United also. However United are definitely the favourites.
The recent results the team keeps getting in recent times is enough discouragement for the players to get them loose their confidence, sometimes I try to narrow the issues with Manchester united to a certain aspects of their play but sadly it turns out that it's all interrelated as the reason a certain aspect is not very functional could be linked to the weakness of the other.
Taking a good look at the defense, your would see and understand that the defense is lacking in communication and they don't seem to have that chemistry that is supposed to bind them to create a team play, this on the other hand weakens the strikers as when ever Manchester united happens to first concede a goal, they are pressured to gat a goal first before getting a lead of which if the defense were solid enough some goals could be avoided, sometimes the strikers have to fall back to assist the defense and this could be stressing on them, lastly the midfield is gradually becoming messy as the lack the ability to get full control of the ball from midfield and move it to their opponents side of the field, I hope they improve and win their next game against Sheffield.