Hi Hamish,

> This is strange. If I close eg Firefox, the all the (20+!) listings
> for that process go away.

Did you have quite a lot of tabs in that Firefox?  It uses multiple
processes these days, roughly number of tabs plus a few.

> What's weird is they all have PIDs, but there aren't that many PIDs
> shown in the process list (or ps aux).

‘they all have PIDs’: where are they if they're not in the output of
ps(1)?

What's the output of

    (
        cat /proc/meminfo
        ps xauww | sort -sk6,6n -k2,2n
    ) |
    curl -sSgF 'f:1=<-' ix.io

when the machine is having problems.  Ignore the NAS for now, it's got
too many unknowns.  :-)

-- 
Cheers, Ralph.

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