Usage showing -

Hi all...

Having just got my 3g iPhone I upgraded to the new firmware 2.0.2 and everything was working fine. The other day I tried out a speed test website and the phone locked up solid..

I had to do the sleep wake key + home key to reset the phone, I have since noticed that when I go to settings>general>usage
My usage since last full charge and standby both show - and - next to them?

I have done a restore twice and let the battery go completely flat before charging overnight and it still shows - & -

Any ideas anyone?

Thanks

Andy