Things have been rather good since about 2 weeks.
I got another ' freeze' problem today. At me, the freeze was selective: ES and NQ out; ZB,ZN, ZF ok; DAX, ESTOX ok. My 'Market Data' label went orange. (Not sure what green, orange, read truly means).
Shutting down and restarting TWS brought everything to normal.
This TWS failure is very nasty, especially if freezes occur selectively. This would require monitoring of individual issues with some kind of failure detecting strategy.
It is overly clear that something is badly wrong. IB never really addressed the problem, always making it look like complaints come from incompetent bunglers.
I'll say this once more: FOR YEARS THESE KIND OF RECURRENT FREEZING FAILURES WERE UNKNOWN. It all started a few months back when they introduced all the new non-brokerage stuff. Thing became simply unreliable to a degree unseen before.