I've noticed:
1) There's some code missing to control the Pop Up login window. It usually pops up, when I'm almost through (and, I type reasonably fast) logging into the main, top of page login box. Been that way for quite a while.
#1 is slightly annoying (to me anyway), but not a new problem, and maybe not your issue.
2) Many other sites have a dropdown control in the main login box, that allows you to spec how long you want to login for (1 hour, 1day, 1month....). If TBN has that option buried somewhere, I haven't found it yet.
And, I find the default timeout for login is pretty short.
3) My thread subscriptions have not changed (in terms of deletions, or delivery control mods by me), but I've found within the last week that some thread notifications don't arrive by email now. AFAIK, my email account is fine, other normal traffic has not been affected.
There may be some general IT issues that are being worked on, with a bit of turbulence being a factor for you.
Hang in, the site does usually run very smoothly.
Rgds, D.