I purchased an Intel NUC D34010WYK in September. Since January it has become very unstable.
My system has been freezing up, Windows often times gives blue screens and restarts with different errors.
I've reseated the RAM and mSATA SSD, applied new thermal compound to the processor heat sink and fan thinking it was an overheating issue.
The hardware I put into it:
RAM - 2 x Crucial 1.35v 204 pin 4GB DDR3 PC3-12800 SODIMM
SSD - Plextor 240GB mSATA
I also have a SiliconDust Network OTA Dual Tuner.
Logitech Wireless KB and Mouse, as well as a Windows Media Center Remote that uses the IR sensor on the NUC itself.
I did not oped for a wireless card since I'm hardwired to the network via 1Gbps network interface.
The device itself sits out in the open, I've made sure it is not surrounded by anything so that airflow won't be a problem.
I've attempted to run both Windows 8.1 Pro with Media Center and Ubuntu Linux on it, the only difference I can tell is that Ubuntu doesn't reboot, it just hard freezes with no errors and doesn't restart.
What I'm doing at the time the system freezes:
Typically I am watching something via a live stream, or Netflix in HD format. Sometimes I watch rips of Blu-Rays I keep on my file server so I don't damage the discs from usage in a Blu-ray player. I also on occasion kick on Windows Media Center and watch Live TV from my network TV Tuner. I'm not gaming on this device, I have a separate PC I game on. The system can sit idle for days on end if I don't use it just fine, but when I start to do any of these tasks it becomes very unstable.