My Cloud access problem

[chequers]

i have just purchased a My Cloud Mirror. and i have problems accessing it.
after a few hours i can’t find it on network either from computer (Mac) iPad and phones, all blue LED’s on and stable.
if i do the on off thing it works again and access is good on all devices, but in a few hours it goes off again.
i have a good and stable internet.
any advice
Nick