No idea. How hot is and was your sauna? Is it possible that it's hotter than it used to be? Maybe try one that's slightly less hot?
I've got the opposite problem: saunas don't seem to be able to make me sweat anymore, so I'm looking for the hottest saunas I can find.
The usual 95"C, nothing extraordinary. Sweating after covid got impaired, I might have some thermoregulation issue.
95 is pretty hot. At commercial spas I see them start at 70, and rarely above 90.
95 is normal where I live for Finnish saunas. Then there are other types of saunas that start lower, but Finnish are always around 95.
95 is high for Finnish saunas in Finland at least. Public saunas are very rarely so hot here, and few like it that hot.