Thought about what you said...and I think I've identified two occurrences where this happens. Seems to makes sense and coincide with what I think are fund flows. Want me to PM or to post in this thread? Tried to PM you, but I think you blocked the functionality.
Fund flows are unlikely to be exploitable in a meaningful way over time but if you found some identifiable markers(very unlikely) that tend to distort pricing just keep quiet and try to trade it.