In the winter, as soon as its gets a little bit below 0°C, after 10-15 minutes the body of my rear hub gets frozen. This means the pedals/chain do not have any grip anymore on the rear wheel, the pleasure is over, and the walking begins. Peeing over the cassette helps for another 15 minutes, seriously, but I only carry limited amounts.
I use my bike in summer and winter. And try to keep it clean with water and soap (no high-pressure). But it is stored in my garage, where temperature is just above freezing point.
Any tips from preventing it to freeze?