jelly bean update fails

[carguy]

Hi all
Having a littlte problem with the update to 4.2 I am currently running 4.1.2 and get the notification that 4.2 has downloaded and do I want to install. I select yes and the phone reboots. I get the robot tith his door open and the working symbol and then when it gets about 25% done it turns to a red triangle. After another min or two it reboots again and starts up just as nothing has happened and still on 4.1.2 The last OTA update downloaded and installed ok.
Any suggestions??

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