Battery "Usage" time disappearing????

[Loonytik]

I've been monitoring my iphone 4 battery usage times religiously since I got the phone June 23rd. Until the last week I have been averaging roughly 5 hours and 45 minutes of "usage" and about 15-18 hours of "standby"(Great battery life in my opinion). Basically charging my phone in the late afternoon on the second day after a full charge.

The last several days I have been checking my usage throughout the day because I have noticed my battery draining faster than usual. The last two times I have looked I have shown somewhere in the 2 hour 30 min range down to 20% battery. When I check again the "usage" and "standby" times have magically disappeared. The phone shows blanks and "usage times will be shown after the iphone is fully charged." I charge my phone fully 99.9% of the time so the usage times should almost always show up.

Why are my usage times disappearing mid cycle?

Iphone 4, ios 4.0. (Purposely have not upgraded to 4.0.1.)

 

[jman240]

have you rebooted it?

mine was doing this too, reboot helped.

also, got any background apps running, like ones that ping gps for your location?

 

[SonoViva]

Mine was doing this too! Along with not marking emails as read when they clearly were. But yeah a reboot fixed it. Weird.

 

[Loonytik]

I've rebooted the phone a few times. I haven't tried doing a full restore through itunes yet though.