| | Re: BB9900 Display goes off and comes back
There is a light proximity sensor that may not be working correct. Was the phone dropped or was it ever wet? Depending on the amount of light or if the sensor sees light or not it may cycle but generally not continuously.
You can try a reload of the OS but if that does not workthe phone may be defective.
Last resort is to delete any added third party apps to see if one is causing this.
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9810 BES Z10 on BES 9700 BIS