Odd high data consumption on 10.3.1 (and 10.2.1) - on wifi, but routing over mobile network?

Couldn't find a similar recent thread. Just an inconclusive one from 2013 that looked more about the difference between BBOS 7 & BB10.
tl;dr: It looks like my Z10 is routing some traffic to the mobile network when to applications it looks like the wifi connection is active.
I have not previously had high data-use issues with my Z10. On Friday February 20th, I updated to 10.3.1.1581. On Friday March 6th, I got a notice saying I'd used 75% of my data (billing cycle is on the 18th, 800MB limit). At that point, the device monitor said I'd used ~300MB*.
Woke up the next morning and say an alert that came in overnight saying I'd gone past my limit, and the device monitor said I'd used ~540MB.
240MB of mobile network data use while I was at home, connected to wifi, and asleep. The device monitor attributed it to "System". Normally, my mobile data use is mostly PIM and Browser.
I looked back in the data usage report from Koodo and saw that there was a previous, similar spike on Feb 20, earlier in the day before the 10.3.1 upgrade. Right around the time I turned on wifi at work and put the phone on its dock, hoping to start the upgrade. That failed due to AP issues.
I use "Pocket Casts" (Android podcast app). It's set to download only when on wifi and connected to power.
Could it be that it thought I was connected to wifi, but due to weak signal strength, the OS actually routed the connection over the mobile network? I sometimes only have one bar of signal strength in my bedroom.
If that's the case, why is an Android app's data use recorded as "System" and not at least "Android Player"? It looks like it must be lumped in under "System", though, as the wifi usage numbers don't show anything else with enough bandwidth consumption to account for podcast downloads.

hi,
what is Koodo and what do "AP issues" mean?
besides, on Friday 20th, which OS version did you update from?
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Message Edited by Luminescence9 on 05-19-2010 02:44 PM
Attachments:
Light Sensor.vi ‏17 KB
Read File.vi ‏51 KB

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Odd high data consumptio​n on 10.3.1 (and 10.2.1) - on wifi, but routing over mobile network?

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Odd high data consumption on 10.3.1 (and 10.2.1) - on wifi, but routing over mobile network?