Hello, Jeff. For the power and volume button pad, there may be one or more problems with it. Please take a look at the volume button pad section on our troubleshooting page. It sounds like it could be a dirty connector or misaligned button pad. The power button may not be responding due this problem as well.

Was this phone purchased recently? Has this happened before or again? Going forward, if it is under warranty, you can send it back to the manufacturer. If not, you can try taking a look at our troubleshooting page for the G3.