As part of our ongoing investment in our development platform, we recently made some infrastructure changes to help stabilize the statuses/filter and statuses/sample endpoints - making them less lossy and more supportable in our data center. You should now receive a more complete picture (within the tweet limits) of the topics you stream.
As a result of this change, the latency will vary on this endpoint a bit more than previously. If you need a low latency streaming endpoint, we do have enterprise access available where we focus more on delivering data for latency-sensitive use cases.