Why would cops come to my house at 6am? 3 times?

So, they came 2 times and left buisness cards. Nobody was home. They came again at 6am I wasn't home my roommates answered the door. Apperantly no information on what they wanted was discussed. Here is the situation I'm in: 1. I have a crazy x who literally drove out of the state to follow me. He is FILTHY rich and has cop friends that will plant illegal shot in my house to lock me up. Scary! But I'm sure he knows I don't live there anymore by now. 2. I am currently supenaed as a whitness to a major pimp bust! Serious he had like a fake buisness to launder his money out of the country and. He is part of the Russian mophia and I have personally met some of his dirty cops. He as well is filthy rich. My friend said they could have been there to make sure I got my supena but I have already talked to the atterny and the detectives who brought/ordered to supena.