Same problem for my fleet too. At Prague, My 80 of 110 B738 planes need maintenance and my airplane is full of B738. But my other planes not affected. I think any new update doesn’t solve maintenance problem.
Same problem here. Half of all my planes suddenly need maintenance. Really strange. What is happening. I can understand that it was a little bit too easy to make money but this update is crazy. This will not attract new players at all.