Relevant factors have definitely come up before to pick the series. Sometimes it's that the next volume is about to begin prepubs after a while off, sometimes it's that it has an anime airing.
Mixed Bathing is one I wouldn't be surprised to see, since it has the final volume currently in prepubs after a big gap. Getting people interested in it when it's about to be complete might be helpful in reminding them the series event exists.
Also possible that they'll pick another Sol Press rescue after VRMMO this month.