Data disconnect issue on LolliPop

One thing keep users away from running LolliPop on HOX: Seemingly random data disconnects.

I found a way to replicate the issue:
- Make sure you have internet on gsm (wifi off)
- Enable wifi, wait for full connectivity
- Enter AirPlane mode
- Toggle AP mode off
- Wait for wifi connectivity
- disable wifi
My phone will not connect 10-50% of the time - enough to make experiments.
One interesting observation: During no connection, just by entering "Phone info" (*#*#4696#*#*), radio get initialized.
From some of the logs it looks like android just reuse old data, but forget to initialize radio with it (or maybe ril don't understand?).
There are also some interesting Exceptions here and there.

HERE are two logs from SlimLP and two from CM12.1
One log wil successfully connect after wifi off, one will not.
I believe these logs should be enough to at least point to the root cause.

We simply need a wizard with radio/connectivity magic skills. @Thömy @eyosen @Lloir @Demetris or
anyone knowing such a wizard, please summon one.