Close shutter flip flat box

Hello sgp users.

I just bought a flip flat box. It came from deepskydad. It work well with sgp but…

I use sgp with long sequence so it take le mire than one night to end . So séquence is paused between two night. In the manual i see
“In addition, these types of flatboxes will automatically close their shutter when a sequence ends.”

Yesterday i run a séquence wich was paused until next night and the shutter don’t closes
What can i do ?
Thanks