IOS 4.3.1 intermittently restarting iPhone 4

I recently upgraded my iPhone 4 (model MC605ZA) to iOS 4.3.1 (8G4) and have experienced 4 random reboots of the device since upgrading. At the time of each of these reboots the phone was sitting on the home screen and was not in use. The screen simply went blank and then the Apple logo displayed. After the regular time period had passed the phone was operational again.
Wondering if anyone has experienced this as well? Only started happening in 4.3.1 otherwise the phone has worked perfectly for the past year.

It is happens to me too. I restored countless times.
Behaviour is unpredictable. I can take the phone from my pocket and try to turn it on, but there will be no display. Or it can be at home screen, and then go unresponsive, showing the Apple logo and spinning wheel.
This only happened with 4.3.1. No open apps as well. What's going on?

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