I think this is what's going on privately, but it wont come out. To back up what I'm going to say, several people have noted that they saw a change with Lamar starting this season.
Lamar won't admit it, but he's upset the Ravens got rid of Hollywood. I think that's the reason he's being difficult. Those guys are BEST FRIENDS and they traded him. The reason he didnt resign when they supposedly offered him a deal 2 years ago was because Hollywood's future with the Ravens wasnt clear. It's a business, but Lamar is still young and his mind is not there yet. He's holding a grudge against the Ravens for the Hollywood trade.