Don't be surprised if you get some temp spikes, in fact, be looking for them. I think, at least in my situation with my particular thermostat and my management, when I put the humidity up for lock down, it either messed with the reliability of the thermometer, or it messed with the thermostat it'self... or I jumped in to micromanage. The last 3 days were accompanied by wild temp swings as I tried to get things in synch again. I also noticed some temp spikes around day 7, perhaps due to increased chick metabolic activity. also, beware of pet curiosity as you enter lock down. My cats were extremely curious, especially during the last 3 days. I'm sure they could detect egg movement and sounds long before I could.