Why directors hating Prakash Raj?

So far, Prakash Raj has been known as one of the most sought after actors in the cine circuit and there was a time when eight out of ten films had him as the key character. However, that trend has reduced now and Prakash Raj is being seen in barely two or three scenes. Well, it is heard that this is the new ploy taken by the Tollywood directors. Apparently, they say that Prakash Raj doesn't have sense of discipline and those who worked with him before have revealed few bitter experiences on how Prakash used to report late and sometimes never turn up on the sets. While all of them agree that getting a replacement for Prakash is difficult, they are now making up their plans by booking him for 2-3 days and getting their work done to avoid the torture.