Immaturity and buggy Linux

After so many good reviews have been written here about the device, I bought a D34010WYK.
I took advantage of the NUC as a desktop PC and have it installed Ubuntu 14:10. After about 3 weeks of the NUC did not wake up from standby mode. The blue light was flashing as always in standby mode, the power button, however, remained without function.
The unit I sent back and decided to replace the D54250WYK. Now the new NUC also gave up the ghost, in the same way, he did not wake up from standby and the power button no longer works.

FYI: I always had installed prior to installing the latest Ubuntu version BIOS.
Furthermore, I had several times a Freeze with the VLC player, I suspect because of the dependent video drivers (Audio was still in the background) on.

Sorry for the second dead NUC I can here do not assign a single star, the thing is buggy and not enough has been tested on Linux. I also puzzling, as the 5 star reviews come into existence here, allegedly used by many Linux on it ...

Update 5/14/2015:

For those who have claimed the problem with "not Aufstarter to Sleep" is Ubuntu OS, here Release Notes Intel Bios:
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BIOS Version 0038 - WYLPT10H.86A.0038.2015.0410.1634
...
Fixed issue where system with Linux Ubuntu * can not resume from sleep.
-

Who Should Ubuntu uses to perform an update to the above Bios version.