I've had a Lumia 900 on AT&T for about 5 months and have not had any connection problems. However, after the Tango update (OS *.8779.*; Firmware: *.12223), when I take my phone into work (which has no cellular reception normally) for an extended time and then take it outside it will sporadically not reconnect to the cell tower. It will show no connection forever. If I turn airplane mode on then off or turn off and then on the data connection, which seemed to fix similar problems before, I still get no connection.
The only solution is to restart my phone. One time it kind of hung on restart. The other time the phone froze up when I was trying to turn on/off the data connection. Restarting brings the cellular connection back. (Almost as if whatever software is controlling the cellular connection is crashing).
*I also installed the beta Nokia Counters program after the update -so that may be the problem too?
Has anyone else experienced this before. Is it a Tango issue, or a common issue that coincidentally started for me after the update?
I am having a similar issues with Wifi & cellular connectivity Issues. In addition, am seeing that my Lumia 900's screen is turning black with no response from the power button or any other buttons (bottom buttons will be light though). I have to reset the phone by pressing volume power camera buttons. And one or two times today it had issues restarting cycling the Nokia logo, AT&T logo, then black screen about three to four times before it showed the Windows Phone logo to fully boot up.
Same issue. Started happening post Tango update. Never had a problem before. Only thing that seems to work is powering the phone down, waiting a few seconds and bringing it back up again.