Little giant incubator. Display blinking, temp dropping, chicks zipping

[MildlyOffensiveChicken]

Two chicks are zipping
Real temp is displayed every 4-7 blinks. It is dropping. It isn’t heating.

What could be cAusing this?

Should I open and spray the fan and sensors with compressed air?

 

[MildlyOffensiveChicken]

It resolved itself. Temp is good and so is humidity.

 

[MildlyOffensiveChicken]

It’s being temperamental. Watching the temp. I did this in a non ideal location - semi climate controlled camper. Two others have pipped, a Delaware is moving and positioning for the zip. The Icelandic pipped about 12 hours ago. No progress. 2 Icelandic and 6 Delaware have no action. They all had embryos and to my untrained eye a chick when I took the Turner out. Does hatch day vary a lot?

One chick is out.