98 wrangler just replaced the durango box I had in it as it started to bind a month after adjusting it. Replaced it with an rebuild stock PSC box that I removed a couple years ago because of play in the wheel. With the new box installed it was operating as normal for a few days. Turned lock to lock very easy. However today I got stuck in some traffic and right after that the steering would go from hard to soft as I turned it. It doesn't feel like it is binding just harder and easier to turn. The fluid was low so I added more but still doing the same thing.... Also there is no rhyme or reason to when it starts to get hard or soft.