I'm so sorry to hear thatThe only thing I can really think of as a cause would be mold - you said you kept it in the same enclosure as you got it in without any changes, it could be that the previous owners were careless and let the enclosure get dirty and just cleaned it out before you got it just so that they didn't look bad. If it had been exposed to mold prior to you owning it for a long enough time, it could be fatal. But it really could be anything, that'st he thing with these guys. SADS ("sudden arachnid death syndrome") is really common especially in young ones.
Again, I'm very sorry for your loss
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