i know what you mean. that happens to me from time to time. what normallly happens to me is well i start from the floor on a line, then i go to a chicken beam, and then ill go the beam. and what startles me when i go to the beam is when my coach makes me go to the beam with a bad lead up. and maybey thats whats happening to you. my advice to you is to go back to the floor and work your way back up and dont go back to the beam unless you end on a good one and your feeling confident with them. and maybey one day when there not good at all on floor maybey, just go to your coach and tell him/her that there not good today, so you can work on something else. another thing that may be a problem is that your shoulder flexibility is not the best. thats the worst with me cause its a big factor whether you think about it or not . so yeah ! hope it helps!