"Amateurs train until they get it right, professionals train until they cannot get it wrong. Amateurs train until they get it right, professionals train no more than they are paid to."
E. Charles
Than there is:
Equip./ammo, component failure, kinda a monkey wrench of reality that just throws everything to Murphy's law.
Your "x" thousand dollar, sponsor inspected, tweaked and freaked, custom firearm is still prone to bad ammo, bad "something"......
I too am sorry they had problems, it leads to better components and ammo, for us "average" non-pro shooters.
and keeps them on their toes,.....