I am having 2am disconnects every day since May 1 2019 exactly (they get logged by my router). in North London. I started a new thread as I did not see this one. I posted TBB ping graphs but I dont think they appear (my image uploads get blocked). Is yours actually fixed?
check the upstream levels, in upsteam bonded channels, a value of 5.1 in the power column may be what causes a nightly reboot as that value is on the high side. I still have the reboot problem and I have this value. For me the solution may be to have an engineer visit to add a mains powered splitter/booster but I have been too busy to book an engineer visit.