Yes, unfortunately IB's Eurex feed sucks recently (has been quite stable over one year before).
About 4 weeks ago they suddenly showed no volume for some symbols (FDAX JUN, FDAX MAR, FESX JUN) sometimes dropping it within the session.
When asking customer service about this they confirmed the problem but told me that they needed "about two weeks" to fix that.
Price data was ok though.
Other data providers showed no problems during these times.
Seems that Eurex is low on their priority list.