It’s rare the hubs power cycle themselves - it’s more likely just losing connectivity to the network.
Does everything stop working as in wired and wireless connections?
What do the lights on the hub do during this time?
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I have taken a look at the account and we have identified a short term network issue that could cause an intermittent service. We believe it will only be a short term issue and it will be fixed very soon. However, in the mean time, it would be great if you could check that the coax cables are connected securely to the equipment, any splitters (standard and powered) and to the wall socket.
I note your downstream power levels are also out of spec therefore I have book the next available technician appointment for you. Details of this can be seen via your online account. If this is not convenient, you will see an option to re-schedule.
Hope this helps @mrkb and let us know how the visit goes 🙂