I had a thread about this in the Slackware forum ages ago. This Thinkpad X200 will happily run Slackware64 14.2 or current for a couple of months or so. Then it refuses to boot up fully, with any one of three errors at random. If it was only one error all the time, it would be easier to pin down the cause. I've done websearches on the errors - no luck.
To add to the confusion, it's run Kubuntu 20.04 (64-bit) for months now, with no problems.
It was bought refurbished, in very good...