To really tell if there is a problem, I will need your exact setup, with the board in question or CR shipped to me. Then I can quickly test the CR and tell if it's faulty or not.
Anyway, the code you posted is very basic.
I did similar tests many times with Moteinos during development of CR, and even more complex code, waking up, transmitting, going back to sleep, or just flipping state from wake to sleep.
When I ask a board to SLEEP, I expect it to go to 0mA, not jump around like a rollercoaster, that's what I see in your video, so that doesn't inspire confidence that the node is truly sleeping.