Weapon Randomly Broken In M+ Boss Fight Becomes Unusable

So, I always hop on my yak and let people repair and mog before going into a m+ often times because you can’t mount up in a lot of dungeons. I did this before going into a Vortex Pinnacle+12 and I repaired, everything went fine, the only person that died was a random warrior in the group. We get up to the final boss and right as he casts Static Cling my weapon suddenly drops down to 0 durability and becomes red and I am unable to use it, which is fatal for a MM hunter. I literally had no option but to run around and pop my self heals as often as I could to just avoid dying, there was nothing I could do. I’ve never seen anything like this happen before. I even threw out an auto-hammer and tried to repair mid fight, but that didn’t work. I tried to feign death to see if I could get out of combat, maybe that was the issue idk, but nothing was working. I repaired before entering the dungeon and didn’t die through the whole thing, there’s no reason for my weapon to just drop down to 0 durability like that. This could have ruined the run tbh, wtf happened?