Yeah, this does seem new. This thread seems to have a similar symptom: /g/twsapi/topic/88795216#msg48912 .
It doesn't feel that fields are missing randomly. In the most recent instance, all the bids of a bunch of stocks are missing, no matter how long I wait or retry. Statistically, this cannot be explained by the field not being updated because there is no new data.
Being a hassle aside, I am also worried that updates for some fields may suddenly stop and cause my program to silently consume wrong data. I have never tested this possibility, but it seems possible.
I would really appreciate if people could share about the problem/solution.
