Some more traces when reproducing the bug:

/system/bin/logcat -v threadtime -b main -b radio

...
04-14 09:31:21.057  1844  1861 D use-Rlog/RLOG-AT: +CGEV: NW DEACT "IP", 
"100.125.255.239", 1
...
04-14 09:31:21.058  1844  1861 D use-Rlog/RLOG-RIL: configureNetworkInterface: 
Down E
04-14 09:31:21.105  1844  1861 D DHCP    : ifc_down(ccmni0) = 0
04-14 09:31:21.106  1844  1861 D DHCP    : ifc_set_addr(ccmni0, xx) = 0
...

The "NW DEACT" event means that the network has forced a deactivation.
The interesting thing is that I get this when I deactivate WiFi, but
only with one of my SIMs. The reason might be that I do not have enough
credit to enable the data plan for that SIM. Why this happens exactly
when I disable WiFi, I don't know. Maybe the connection had already been
dropped by the operator and the modem notices at that time for some
weird reason. Anyway, this event is the same you would receive if data
is dropped for other reasons, so I hope this reproduces the bug.

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https://bugs.launchpad.net/bugs/1435328

Title:
  Leaving Wifi does not connect to mobile carrier data (GSM)

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