Aside from the Rosenberg level conspiracy, is there any reason to believe that this rosin has a long shelf life? I've been using Nymann for around 30 years, but in the last decade or so have been disappointed by how quickly it turns to stone. I don't remember this being a problem in the '90s, and wonder if changes in formulation have affected longevity. Since I no longer play regularly, I would be happy to pay a premium for a cake which stays soft for two or three years.
Doubt it is from any change other than normal organic variations in the rosin.
Get a Rosin Saver can to keep it in. It will keep a pops cake soft for about a year even with opening 4-5 times a day. I have gone from 8 cakes a year to one siince getting the container.
In my experience, bows that are not played daily become problematic. It also helps to keep using the rosin daily. Every time you swipe, you keep the rosin from developing a dry outer membrane.
