I had a similar problem on my Nexus 5 after I rooted it. Previously, everything worked fine for rooting, but then I had the following symptoms: - The data connection was accessible and functional after rebooting. - If the data connection was disconnected, it would not turn back when selected. He returned only after a reboot or occasionally after a while (for example, 1, 2 hours).
I tried to start the radio, but by mistake it was the Preview Preview version (LPX13D). Keep in mind that this version of the radio does not work, and after rooting these problems are related to the lack of access to data. The flashing final version of Lollipop Radio (LRX21O) worked like a charm, and the radio data connection came to life again.
Hope this helps someone need it :)
Mathorlaz
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