Again, I don't want to beat a dead horse, but that really sounds like a cracked guide. Someone please correct me if I'm wrong but I have never heard of a braid failing so bad that it breaks with no tension. If so, that is just embarrassing and they should pay you off to not tell anyone.
Just to be on the safe side, before you spool on your new spool of braid
I would check the guides again. Like I said before visually doesn't really cut it. I saw a guy loose his rig three times on a charter boat once. we both looked at all the guides and could not find a thing, but when I started running braid through each guide I found one that cut the line clean with no effort. If it cuts more on the descend then it is probably on the top of the guide were the line is not touching when you are reeling in. the line gets cut or nicked when it's unwinding of the spool, the little bit of slack in the line enables it to hit parts of the guide that would not normally get hit when you are reeling in with some tension.
To check the guides use a piece of braid about 16" long and check one guide at a time. run the line through the guide then pull it up and down like dental floss and go all the way around the guide. your goal is to get the line to run across every part of the guide. then check if there is any damage to the line before you do the next guide, although if there is a crack the line is most likely just going to be cut.
If I'm wrong then I'm just a stubborn pain in the ars, but I think, better safe then ruin a spool of braid. Let me know what happens cause now I'm real curious about that braid if it is just failing like that.