Depending on your phone, you may need to disable battery optimization for Signal.
Brrrrr, chilly. I found that in the wintertime it is better to ferment (proof) my soudough bread in the oven with just the light on. The oven light is usually a 15w-30w "heater". My oven goes up to 36-38°C with just the light, so I prop the hatch open a bit.
The temperature makes a huge difference with #sourdough, at least in my experience. See this in-depth post https://www.thefreshloaf.com/node/5381/sourdough-rise-time-table
C.IM is a general, mainly English-speaking Mastodon instance.