Man United performance looks very unstable lately, it is not really surprising if they missed again 3 points. Ten Hag always changes the starting eleven, which may bring a negative impact on Man United performance. Every time I saw Weghorst plays, Man United probably ends up the match with a bad result. I don't blame Weghorst, but I assume he doesn't fit with Man United tactic.
When you keep on using the same set of player's for every match from the beginning of the season to ending, then the players will get tired, since the beginning of the season till ending Manchester united performance have been nice, but lately Manchester united player's are tired and they need to rest, but they are not getting the rest because Manchester united are not have experienced players in their bench, if we all noticed the way Manchester united players have been playing lately, then we will know something is wrong, I think Ten Hag should just work on getting more players when the transfer window is open, so that he will be able to rotate players in matches.
The problem of Manchester United is just players, their players are exhausted. I remember earlier in the season Manchester United players performed very well in every game , even in europa league then but when some of the players started developing injury problem Manchester United began to have challenge with their performance.