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Sorry for the delay. I been away. Also Brash is now globe trotting so I doubt he'll reply to this as his on-line time is very limited now.
Anyway, yes, a fresh install caused the problem initially. So then I tried installing 2.0.14 and then upgraded to 2.0.15. At first I thought it was OK, but after about 10 minutes it happended again.
So in the end I reverted back to 2.0.13.2 which I use now and it is running without a hitch.