I had the same problem in one of my plants this year. It was a big beef that had gotten damaged but had grown back and was doing well. All of a sudden it looked wilted and I let it go for a couple of days until I decided to pull it out I cut the stem and there was no discoloration inside. I also placed it in a glass of water and looked for streaming of bacteria to which would indicate bacterial wilt and there was none. Then I noticed the brown discoloration right at the soil line. I did not see any insects but it looked to me almost like the stem was rotting at that point. I assumed that it had been damaged and insects were eating it or that fungus had moved in to a damaged spot.
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