NUC6CAYB - seeing mce Hardware Errors on boot (new hardware)

Just purchased an Intel NUC6CAYS. Getting MCE errors on it and a 50% chance of the eMMC actually loading. Some logs and debug info below from a successful boot. Very partial screenshot of a failed boot: https://photos.app.goo.gl/2PflUkzQk4C2lg4C3

Nov 06 00:02:52 nuc kernel: mce: [Hardware Error]: CPU 0: Machine Check: 0 Bank 4: e600000000020408
Nov 06 00:02:52 nuc kernel: mce: [Hardware Error]: TSC 0 ADDR fef13b00 
Nov 06 00:02:52 nuc kernel: mce: [Hardware Error]: PROCESSOR 0:506c9 TIME 1509955370 SOCKET 0 APIC 0 microcode 20
...
Nov 06 00:02:52 nuc kernel: mmc0: switch to bus width for hs400 failed, err:-84
Nov 06 00:02:52 nuc kernel: mmc0: error -84 whilst initialising MMC card

Any input/followup Q's welcome.

00:1c.0 SD Host controller: Intel Corporation Celeron N3350/Pentium N4200/Atom E3900 Series eMMC Controller (rev 0b) (prog-if 01)
Subsystem: Intel Corporation Celeron N3350/Pentium N4200/Atom E3900 Series eMMC Controller

ras-mc-ctl: mainboard: Intel Corporation model NUC6CAYB

lspci: http://sprunge.us/ZQCP
lspci -vv: http://sprunge.us/XBeS

/sys/kernel/debug/mmc0/ios: http://sprunge.us/KWCb
Complete dmesg: http://sprunge.us/KRDE
dmesg errors: http://sprunge.us/YeVY