Sorry slow getting back to this. Seems to be going ok now…
This is what I did:
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Removed nvidia card and tried using internal graphics. This installed nvidia drivers for internal graphics.
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Seemed to be much more stable as a result of this.
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Possible nvidia card had come loose and wasn’t seated correctly - but only a maybe.
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Re inserted nvidia graphics card. Seems to be pretty stable at this point.
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Removed all nvidia drivers as per the first part of this guide.
Does seem pretty stable now. Has only crashed once. Time will tell. One thing I did notice but not a 100% on this, is now the driver says it is open source (nvidia 340.96) where as before I’m sure it said proprietary.
Thanks for all the help.