WHITEBOARD GETS ERASED EVERY TIME I CLOSE IT

[sessi]

Would be soooo grateful if someone could help.

SO:

I write on the whiteboard,

then I close it and go back to the main room.

When I re-open the whiteboard again during the same meeting, whatever i had written is not there anymore, it gets deleted and i have to restart with a fresh whiteboard. 

Anyone can help keeping the writing on the board ? THANKS! this is driving me mad!