Has anybody encountered this problem or know of a solution?
1. Dial voicemail (*86 on my phone) using entry in contact list
2. voicemail system prompts me for password so I press power or shake the phone to make the display reappear
3. (this is where the problem occurs) any time I hit a button the display goes blank, and reappears a second later, without recording the keypress. If you repeat this step just 3-4 times, the screen starts going blank and reappearing without any interaction.
This is a semi-intermittent issue. I tried it again (to ensure I had the details correct for this post), and it let me enter my password, but then exhibited the problem when I tried to press 7 (to delete a voicemail that was playing). The next attempt I was able to enter my password and delete a voicemail without any problem. I didn't restart the phone or do anything other than end the call, go to my contacts list, and search for voice (in my contacts list, using the box at the top).