Well I got my Adam two days ago and have been having nothing but problems with it. It booted fine the first time. I turned it off and tried to turn it back on again and all I got was a black screen. I could see the backlight of the lcd was on, but nothing would show. So I turned it off and tried to boot into recovery. Nothing...
To get it to do anything I had to use the unbrick through force recovery method. This would install and boot up. But as soon as I turn it off and try to turn it on again I get the exact same thing.
I also have the standby/sleep issue. As soon as it goes to sleep I try to wake it and nothing happens. I have to hold down the power to get it to boot up again, which as I said above, it will not boot again until I unbrick it in force recovery.
I emailed Notion Ink the night I got it and still haven't heard back from them 2 days later. But it seems like some sort of hardware issue to me.