00:55:35, 13 Mar.
WAN connection WAN2_INTERNET_PTM disconnected.[ERROR_NO_CARRIER]
I can give you an update which may help you, depends on your connection (cabling etc).
First - I have found the g.fast faceplate/g.fast is very sensitive. Even accidentally tapping the rj11 cable (modem cable) in the faceplate (mine is under my desk) will cause disconnects.
Secondly, I had a super short (2m) cable run connecting the bt termination connection outside my flat to another junction inside which was lower quality cable (a cable bt used in the late 70s/early 80s that was partly copper, partly aluminium) - I have replaced that and whilst I also cannot understand why I also used to get dropouts every few nights at similar times as yourself, this has stopped happening. Although it would connect just above 100Mpbs sometimes and work for a few days it would still disconnect overnight sometimes. After changing that cable it was stable but weirdly below 100Mpbs - around 92-95Mpbs (despite copper being better conductor than aluminium). No dropouts.
Finally, I bought, via eBay, a specialist rj11-rj11 cat6 shielded cable to connect modem (smart hub 2) to faceplate (about £16, made in UK) and on first connect it connected at 106Mpbs, and advanced log suggests data rate (down) can go as high as 110Mbs.
Not sure if any of that helps but thought I'd share.