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Review your hardware, because that's the root cause, or upgrade to LR6 which (as far as one can tell) resolved the problem.
I have Lightroom CC, not sure what you mean by reviewing my hardware but
the desktop is fairly new (about 12 months old), 4k monitor, I have updated
to latest version of CC, but still happening, but doesn't seem to be quite
On Fri, Aug 4, 2017 at 1:58 PM, john beardsworth <email@example.com>
"Fairly new" hardware can still malfunction. The most likely cause is some hard disk malfunction, perhaps a bad sector.
As far as I have seen, Lr6/2015 resolved this problem. So are you sure you are using CC2015.12, which is the latest version? Go into the Help / System INfo menu, copy the first line and paste it here. Sorry if this seems ridiculous, but we do get people saying they are up-to-date when they're not.
And are you absolutely certain that the WorkingCatalog Previews.lrdata is really the previews cache belonging to the catalogue you were using at the time of the problem? In Explorer or Finder, just check the date modified of the lrcat and lrdata files.