iPad Pro sleep wake button problem

After turning off my new iPad Pro (space grey 4G LTE version) for a while and turning it on with the sleep/wake button the screen turns on but turn off immediately. I have to press the button again to turn it on. This problem would not occur if the off-on period is short, i.e., turn on after a ten second sleep. I saw a related discussion post here but cannot read it. Any ideas?