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Heres what to do. Take the battery out and put it back in. You will want to hold both the home button as well as the power button when you power the phone back on. Keep holding these buttons until a screen pops up with a triangle on it and a phone below. Wait 5-10 seconds, and then press the home and power buttons together again. This will bring up the restore options to factory restore the phone. If this does not work, you will need to contact T-Mobile regarding the phone issues.
If it keeps rebooting itself at the G1 and Android screen, you might want to factory reset the phone and clear all the data as there may be a virus. To do this, when turning on the phone, hold the home button and the power button even while the G1 screen comes up. Keep holding these until an image with a triangle comes up. You will then wait 5-10 seconds, and press the home and power button again together. This will bring up the OS screen, and provide you 4 options. One of these options is to wipe and restore to factory. Do this and your phone should work fine after you reboot again.
Have you tried recalibrating the battery? To do this you use the phone until it completely runs out of battery and switches itself off. Make sure it has completely run out by continuing to turn it back on until nothing happens except a red LED coming on. Then charge it while it's off until the green LED has been on for 2 hours. Hopefully this will improve your battery life.
Have you tried a reset using the hardware buttons? To perform this, you need to turn off the phone first. While it is off, press and hold the home key and the power key at the same time. Keep holding the buttons until you see a screen with a triangle and an exclamation point in the middle. Once you see the triangle, let go of the buttons and open the keyboard. Press ALT+W at the same time, and the phone should reset.