Hmmmm, I wonder why the bator wouldn't hold temp ?? could it be a leak at the seal ?My LG doesn't have a gap like that. I tried the whole brick under the bator to tip it instead of turning the eggs and it wouldn't hold temp. So I'm back to tipping the cartons inside. I need to be done hatching. I have way too many chicks and nobody buying. I sold 3 mixed breed pullets this morning for $2 each.
It does not have to be a 1/8" crack.. any leakage will cause what you experienced..
but this is just my opinion..
.......jiminwisc.......