Google Analytics iOS SDK "1 second sessions" (possibly background sessions?)

Question

Google Analytics (using iOS SDK version 3.14 and it's built in sessions tracking) is reporting a significant percentage of app sessions as 1 second.

Maybe users are launching an app to view a page and (effectively) then instantly leaving the app, but that seems unlikely (that it should continue as the top use case. You think such users would stop using or uninstall.)

Initially I suspected this was related to "background fetch" but when I look at a prior incarnation of the application (that did not have background fetch enabled or used) I still see these (seemingly) bogus sessions also. That application (pre iOS9) had no universal links.

The (obvious) reason I don't want to see these sessions (especially if from automated action not user action) is it removes all value of "user behavior"; i.e. loyalty, recency and skews "average session length". These are the main reasons I want to use GA, i.e. to see if folks are using it more/valuing it more.

My questions:

• What might these sessions be caused by? Are they bogus?
• If bogus, how can I stop them?
• Can I ensure new "background fetch" code doesn't somehow trigger them?

Some things I've considered / looked into:

• I am seeing a similarly large set of "short sessions" on an Android application (this application's peer) and again with extremely high numbers. I've been wondering if this was a result of a web searches & site links, with those site links automatically loading the app, and the a (very) quick user "move on". (Universal linking is something the new iOS application is working towards, but doesn't see much of yet.) Given it is not that on iOS I am starting to doubt that it is that on Android.
• There is a "optOut" option on GA. That feels like a sledgehammer solution to this walnut problem. It is also a persistent setting, which feels risky to use for a transient situation. I could attempt to toggle it at applicationDidEnterBackground / applicationDidBecomeActive (and will if it is deemed the solution) but worry it could have negative side-effects.
• One can have multiple trackers. I am planning to attempt one for human foreground activity and one for background operations (which might allow time /event tracking when in background, w/o impacting human user tracking numbers. That said, I don't know / believe this is the cause of the bogus sessions. )
• One can manage sessions manually and also customize the sessions interval timeout, but I don't see why this application should need any custom behavior. It is a normal application.
• The application isn't reporting crash totals to match these numbers; it is a generally well liked 4/5 star app w/ few crashes.

Answer 1

Turns out the problem was inside the Google Analytics SDK. A new version has been posted:

[Google Analytics SDK issue with short sessions][1]