Myself and 3 friends were on a sunny daytime server today, so we decided to go hunting for boar and deer. We gathered our haul of meat and crafted a fireplace in the Red roof barn, between the south-west of NWAF and Vybor Industrial.
We all stood and sat around the fireplace ready to start cooking, one of my team mates ignited the fire with matches..... and immediately we all began getting spammed with Red warning messages saying, "You have Hypothermia". We all had the Red status in our inventory as well next to the Energised, Hydrated and healthy status.

No matter what we tried, ranging from dropping and removing "all" items from our persons and then picking them back up, we also tried swapping clothes, wearing the warmest clothes we had including Wool and Down Coats, Swapping servers, eating and drinking, standing closer to the fire, standing on top of the fire, extinguishing the fire, running around a field in the sun, giving each other Saline bags..... e.t.c.

After around 4-5 minutes of constant status message spamming "You have Hypothermia" "You are rapidly cooling off", You are freezing"... continuously every second or two, 1 of us died... then the second fell a few seconds later... then the third and then the last of us. All dead!

Cannot understand it, if it had been HypERthermia, then yes, a warm sunny day, sitting inside with a fire going, we could understand that. But it was HypOthermia. None of us were cold or wet before we lit the fire and all were Healthy.