If leave a wifi area my xperia z2 doesn't start to use mobile data, so I have to reboot like ten times a day... Also i even lose mobile data without entering a wifi sometimes.furthermore the signal is pretty weak compared to my old xperia Z 😞
So the problem still exists... I tried another sim card but was the same thing. no idea how to fix it... I don't want to send it to Sony cause it would take weeks and I can't live without a smartphone 😉
Finally fixed the issue by disabling LTE in the settings. It's the combination of the t-mobile LTE and the xperia z2. Seems like there's no other workaround...
