Router restarting again and again

[#1]

I'm pretty sure this doesn't have anything to do with the connection, as the problem occurs even without the Router being connected at all (for clarity, it also happens when it is connected). Router is 'Plusnet Hub One' and arrived last week.

The logs show that the restart button is being pressed all the time, although this is clearly not the case.

[#2]

Thanks for getting in touch with us @rorique_beton,

I've just checked the connection this side and all looks fine, as per this graph

Can you think of anything that may have causes these drops in that time? e.g heating, dvr etc.

Thanks.