Okay folks I have a "small" problem.

My computer freezes, it does it bad enough that I have to push and hold the power button to turn it off and then power it back on (hard reboot, power cycle, etc.) to get it unfrozen. I've looked everywhere I can think of and can't find anything in the log files, dmesg,etc and nothing.

When it freezes it shows my memory usage is at 100% and CPU is at 20% (via Conky).

Once in a awhile I can open a terminal session, either by using Ctl+Alt+F2 or Ctl+Alt+T, and it shows the message in the terminal after logging in as Root/Sudo.

Soooo, the $64.00 question is, how do I find what's causing it? That way I can report the bug to the proper place.

Ideas welcomed and thanks in advance for any help given.

How old is it?

What are its specifications? (inxi -Faz)

Have you checked RAM overnight using memtest86 or memtest86+?

Is the inside clean, not liable to be suffering overheating, including inside of PSU?

Is the / filesystem low on or out of freespace?

Are you doing anything in particular when freezing occurs?

So for the first question, Disk is 46.7GB/ 92.0 GB
Memtest is fine. Inside is clean,
That I know of, it's just sitting with my email program running (Evolution getting GMail & local mails [Log reports]) so nothing major.

I am getting notices about Exim Panic log having a non-zero size.But it's from Popularity Contest and I have a bug filed about that.
I just want to figure out what's having a tissey fit so I can report it or at least know how to find it so I can kill it.
DMESG doesn't show anything or any log files I can find.

Does /var/log/journal/ exist? If not, create it, if you would like a persistent journal. For current boot, simply sudo journalctl -b should be as much log as needed for scanning. If you think something is failing, try sudo journalctl -b | grep -i Failed. man journalctl

Failing to start the journal service the only thing I can think of would be a disk write error, but I would expect automatic retry to succeed, or a more serious error message to follow. Did it subsequently start? Are there any messages on vtty10 or any other vtty? Is /var/log/ and everything in it except exi* owned by root:root, root:4 or root:modem?

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Well I tried the commands that MRMAZDA gave and grepping for Failed and Error doesn't show much of anything: So maybe I'm missing something. This only started within the last 5 upgrades (Dist-upgrade) so I'm reasonably(?) sure it's software related. The log file is there and of course it has nothing useful there either. I'll test the disk with S.M.A.R.T. monitoring and see if it's my disk.
Thanks for the help so far.