I used jailbreakme.com to jailbreak my iPhone 4 on 4.0 which worked perfectly, but after a few days my phone would crash and restart by itself so I decided to restore my phone and the problems went away. So I decided to rejailbreak my phone using jailbreakme.com and I get an error message that says the installer crashed last time you tried to jailbreak. I tried jailbreaking again and the phone goes to the screen where it says, downloading, this may take a while and then it always crashes and exits safari on my phone. Anyone know a way to get around this?