I definitely increased my max lights and upped all my settings.
My boyfriend also plays stonehearth and he wasn’t having any issues at all. At first I thought it was my mods because generally, when I have game problems it’s because I’ve downloaded too many mods and one of them does not work correctly (either with the game or just the other mods in general). After Golden mentioning it might be my lights, which I at first rejected because I had NO other lights than the hearth, I then noticed that the freezing happens exactly when they light the fire.
In any case, when comparing my game settings to his, mine were much lower. My boyfriend thought that maybe my settings were too low that the game didn’t know how to display the lights at nightfall or something (guessing in the dark after like 2-3 days of me test running stonehearth, which by the way I would think the problem was fixed if my hearthlings started with no wood and speeded through the first couple of days without lighting the campfire).
Since I have a new computer I turned all the settings to max, loaded the game just before nightfall, watched the hearthling grab the wood and start to light the fire and viola! It didn’t freeze ^_^.