None so far.
Exept when i was forcing the visor on(kinda cracked)
This mask is so sick for a long game. i used it at a big senario event and it fogged wait dont panic i forgot to take off a plastic peel on the inside of the lens. An after i did it was so clear. This mask is perfect for all levels. and if you are a heavy breather which i am and not a hint of fogging.