Hi Bryony,
    I would second the suggestions that the others have made to check
power saving and the possibility of overheating. My further suggestions
are check if the tablets are shutting down completely,pointing to the
overheating issue or just the screen shutting off, pointing to the
power setting issue. It would also be worth checking that its not
just the videoplayer app that is crashing to a black screen making the
device look like its turned off. I've known people be fooled by that
sort of thing.

Catherine Jones
Owner The Weird Workshop

http://theweirdworkshop.com
twitter: @weirdworkshop

tel: 07758236699

On 2018-02-14 16:14, Bryony Benge-Abbott wrote:
> Hi all,
>
> We’ve recently launched a new exhibition at the Crick and have used
> two different types of tablets in the gallery – Lenovo Tab3
> Essentials and Amazon Fire HD. We are using them just to play films on
> loop, and are leaving the exhibition switched on 24/7. Alas, they keep
> randomly switching off despite us making sure they are on aeroplane
> mode, plugged in to charge, and screen-locked to stop visitors being
> able to use them. Other screens and lightboxes are using the same
> power source so we know there isn’t an issue with the power supply.
>
> I wondered if anyone on this mailing list has had experience of
> working with these models or similar issues at all? We are drawing
> quite a blank…
>
> Many thanks,
>
> Bryony
>
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