[CentOS] Debugging Kernel Problems

Not sure if this is the correct subject line but my recently installed 
Centos build (Linux localhost.localdomain 3.10.0-229.14.1.el7.x86_64 #1 
SMP Tue Sep 15 15:05:51 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux) 
periodically just freezes - completely locks up, no activity, nothing in 
the logs, just stops dead requiring a power off and reboot.

I've really looked around to try and find the _best_ way to set up 
debugging but there is a lot written about it from a lot of parties but 
I'm not sure who the definitive source is.

I did try booting with the 'CentOS Linux (3.10.0-229.14.1.el7.x86_64) 7 
(Core) with debugging' option but that really didn't add anything to 
finding a solution.  Dmesg did report this however:

dmesg|grep debug
[    0.000000] Command line: 
BOOT_IMAGE=/vmlinuz-3.10.0-229.14.1.el7.x86_64 
root=UUID=1928d2da-784c-4b18-868c-f9858bceea6d ro crashkernel=auto rhgb 
quiet LANG=en_US.UTF-8 systemd.debug
[    0.000000] Kernel command line: 
BOOT_IMAGE=/vmlinuz-3.10.0-229.14.1.el7.x86_64 
root=UUID=1928d2da-784c-4b18-868c-f9858bceea6d ro crashkernel=auto rhgb 
quiet LANG=en_US.UTF-8 systemd.debug
[    0.940176] ehci-pci 0000:00:12.2: debug port 1
[    0.946472] ehci-pci 0000:00:13.2: debug port 1
[    1.238335] systemd[1]: Unknown kernel switch systemd.debug. Ignoring.
[    5.083981] SELinux: initialized (dev debugfs, type debugfs), uses 
genfs_contexts
[    5.206423] systemd[1]: Unknown kernel switch systemd.debug. Ignoring.


Which I found interesting.

So, can anyone point me to a detailed guide to debugging what's going on 
with my build that will help me solve my locking problem?  BTW, I think 
it might be my wireless Atheros equipped PCI card (dmesg|grep -i atheros
[    2.231264] ath5k: phy0: Atheros AR2414 chip found (MAC: 0x79, PHY: 
0x45) but can't be sure because I've not any real proof that's the issue.

Thanks in advance for your patience and assistance.