Ali
It is happening again
First, go to your squad list to see how happy he is (the bar at the side of his name), if this is low (for whatever reason) it can effect player condition. If you've put a few players on the transfer list, other members of your team can be unhappy.
Also, check the players consistency/form (I can't remember the exact name) attribute - it's towards the bottom of his attributes. If this is low, they're more likely to have down arrows. If you're not too long into your ML, you can quit and make his attribute higher, then start again.
Also take note that the arrows are generally worse in away matches.
Other than that, not really much I can say. Player form can be kinda random, you know, it is possible that you can row a dice 30 times, and get a '1' 30 times
Also, check the players consistency/form (I can't remember the exact name) attribute - it's towards the bottom of his attributes. If this is low, they're more likely to have down arrows. If you're not too long into your ML, you can quit and make his attribute higher, then start again.
Also take note that the arrows are generally worse in away matches.
Other than that, not really much I can say. Player form can be kinda random, you know, it is possible that you can row a dice 30 times, and get a '1' 30 times