[philosophile]

I think it has something to do with the individual needs of the specific shroom. Some shrooms seem to do well with low, others with high light etc. Also I suspect that some varieties are far more hardy than others. The one I see the most often is the solid reddish orange one. After that light orange with a sort of cream outline and lines coming out from the mouth. Those two, seem particularly hardy.

I'm also pretty sure there is something immunological going on. The stress from moving, makes it prone to infection, which slowly kills it over the course of a month or two.