I have the same issue as a number of other users whereby my router keeps resetting and I lose wireless and wired connections. It seems to only be when streaming but this might just be that I only notice it at this point because the stream stops due to lack of connection.
Looking at other posts it seems to be firmware but I am on v1.21 which seems to be the latest I have seen on other posts.
I have only had TT internet for a coiuple of weeks and seems to be Ok to begin with, this issue had just started this weekend but it is very annoying when you are trying to watch a film and it disconnects 6/7 times during a 2 hour stream.
Any assistance would be greatly appreciated.