iPhone 3GS reboots every 2-3 minutes

hi,

iphone 3gs
version: 5.0.1
modem firmware: 05.16.05

i'm having issue 3gs. i've restored twice , it'll ok approx month before rebooting issue returns. did not have issue until upgraded 5.0.1, , issue seems happen when i'm in area lose signal, others experiencing well.

i'd downgrade lower version if possible see if resolves issue alot of people seem having exact issue on 5.0.1.

in tiny umbrella, shows i've saved shsh files both 4.1 , 4.3 phone. mean can downgrade either of these? if so, can please provide step-by-step on how this??

thanks!

 

probably issue jailbreak (i'm assuming it's jailbroken)

 

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