Default [Q] Problem with PAC-rom on my tmobile s4 SGH-M919

So I have a T-Mobile Samsung galaxy s4, and I recently rooted using Odin and then I flashed the PAC ROM (BTW I have CWM). But the problem is, sometimes when I turn my phone on , it gets stuck in a bootloop. I then have to go into CWM and clear the dalvik cache,reboot, and then it will work. And I don't think I have messed up while installing because I have previous experience in rooting and flashing. I would appreciate it if anyone had a fix to this, thanks.