Can spontaneously reset if there are signal or noise issues so, check all your coax connections are in nice and "finger" tight at the Hub and wall box and at any splitters/attenuators/etc and that the internal wiring is ok with no kinking or chaffing (rabbit chews!). Also check that all looks good with the outside cabling and wall box.
If that’s all good.... post up your Hub/network connection details and someone will check to see if there is a problem there. In your browser’s URL box type in http://192.168.0.1 (or http://192.168.100.1 - if in modem mode) and hit return. On the first page up [there should be no need to login if have done so already] click on the “router status” icon at top right or the text at bottom middle - of first page up (depending on which hub you have) and then copy/paste 3 sets of data onto here - the downstream, upstream, & network logs. Don't worry about the formatting it can be easily read, but try to avoid using screen shots & don’t include personal data or mac addresses - blank them out.
-------------------- Services: HD TV on VIP (+ Sky Sports & Movies & BT sport), x3 V6 boxes (1 wired 2 WiFi,) SH2 in modem mode with Airport Extreme Router. On VIVID200, Talk Anytime Phone, x2 Mobile SIM only iPhones.