On 24.09.2017 12:38, Mick Sulley wrote:
> Any suggestions on how I can find out what is causing this.

When I had this problem, the root cause was a flaky power supply.

Get a cap-rail-mounted adjustable 5V power supply (e.g. from Meanwell).
Connect the Pi, then carefully adjust the voltage up to 5.15V. That's
still well within spec (+5% tolerance means 5.25V) but helps a lot when
you have transient problems.

The affected Pi didn't have any more hiccups after I did that.

Also, add a 0.1µF ceramic cap between 5V and ground of the 1wire lines,
close to the Pi, to buffer spikes from out there.

-- 
-- Matthias Urlichs


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