this may be stupid but have you ever got grounded or something happened to you that you couldnt ride for a long time and you like lost some of your style, flow, or tricks.
I dont usually get grounded, get good grades only thing mum n dad complain about is the amount of effort i put in so they rarely ever ground me. Snow round here has been a bitch for the past few weeks, I havn't ridden properly in about 2 months, it suckkss so probs lost lot few tricks but got a whole year to learn them again I guess