Think about something that can keep 70+ and consistently. 62 is probably exactly the reason right there.
I ended up using the vent from my refrigerator and/or directly under my CFL bubls inside of a little pouch* to keep it dark. When I had temps dropping below 68, it was causing them to stall and then eventually die due to the water rot.
something like a water heater, heat mat, something that stays consitent until the seeds germ (top of a playstation, etc)
Also- how are you germinating them? I personally use wet paper towel but there are methods that can work better/worse depending on conditions.Sorry; Spongepots… OK. Never heard of that- Glad your last batch popped though- can be infuriating as hell when it’s holding up the whole show