Iphone 3gs keep going black during use

Have had phone almost 2 years, great phone ...... lately it blacks out andhas to be rebooted. Happening more and more often.

The Basic Troubleshooting Steps are:
Restart..  Reset..  Restore from Backup..  Restore as New...
Try a Reset of the Phone... You will Not Lose Any Data...
Turn the Phone Off... ( if it isn’t already )
Press and Hold the Sleep/Wake Button and the Home Button at the Same Time...
The Apple logo will Appear and then Disappear...
Usually takes about 15 - 20 Seconds...
Release the Buttons...
Turn the Phone On...
If that does not help... See Here:
Backing up, Updating and Restoring
http://support.apple.com/kb/HT1414

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