I also had a belt brake on me, the belt had about 20 flights on it and did have silicone sprayed on it. Luckily I was able to save the Heli and had no other damage then the Belt.
EDIT***
Something I did not think of that Matt mentioned on Heli Freak, I did not have all my boom supports glued for probably 5-6 Flights(something I forgot todo!) and it probably put alot of ware on my belt and it eventually broke. So my belt Braking was probably My Fault.
I emailed matt and he sent me another belt, the new belt had a different number instead of the 770XL number on the first belt so I asked him what the difference was and its a different manufacture for the newer belts I guess?
I had about 25 flights or so with the new belt and no problems at all until I crashed it today but that was my fault