ASSASSINs CREED GLITCHES

Hey whats up? So ive bought assassins creed and at the first time it worked perfectly... but like from 5 days to now, everytime i play assassins it looks like it has some glitches... For example, im running and jumping on the roofs and sometimes it looks like it stops quite briefly... It is just like when you are running a game on the pc and the fps(frames per second) arent running at its best... Do you konw whats the problem? and the solution? please answer...

Thanks man... I was starting to think it would be something about the console... But everything fixed