The log isn't quite as bad as it first appears because if you look all those T4 time outs have exactly the same time stamp of 08:00:19. I think there's a little bug in the hub's software that causes that mis-reporting. That said, you should never experience even one T4.
What would be helpful is if you could go back into the hub's Router Status screens where you found the network log and post here all the data for Downstream and Upstream and we can see if your power levels are a cause for concern.
Would you also check that the cable connections to the back of the hub and to the wall socket are done up securely.
Hmmm, ok. Well that's knocked my theory on the head. When you said it happens in cold weather I was expecting to see very high downstream power levels higher than the 10dBmV maximum because you see, cold shrinks the cable length making the power rise ... the reverse is true in hot weather. But I'm not seeing that. In fact your downstream power levels and Signal To Noise ratios are ideal and so are the Upstream power levels.
That leaves those 1143 T4 timeouts which clearly indicates something is very wrong. Channel 1 Upstream is also saying 'Ranging Status - Other' and has some T3 and that is also weird.
I think you will need an engineer's visit. Call 150 from a VM phone (free) or 0345 454 1111 (standard rates) to book a visit.