dose

These cards alone, are only ever cold while they're powered off. So it's quite obvious you've made no real attempt to cool it/them.

This is a heat-related issue. It has nothing to do with firmware revision except that perhaps P20 is more sensitive to high-heat conditions. At the same time, it could just be that P20 'runs' that much more hot. In any case, install a fan on to or over top of your HBA's PU.