I do have a related issue. I justed upgraded from TWS 972 to 981.
My price updates stop a short while after launching TWS 981. However, only the following windows are affected: quote panel, quote details, and order entry. Sometimes not all of them are affected simultaneously, i. e., quote panel might be "frozen" while order entry and / or quote details still update. All quote elements like last, bid price, bid size etc. are affected. At the same time, quotes continue to update flawlessly in charts or in the "classic" grid.
I also see the effect that anytime I click anywhere on the tab quotes update just once in the affected windows.
The only way to get the quote stream going again (for a short time) is to restart TWS.
When I go back to TWS 972 the problem is gone.
Setup: TWS 981.3j (released Jan 19, 2022), offline version, 32-Bit Windows, IB Ireland, tested for Dax future.