PLZ help me!!!! N91 switching off itself after few...

my nokia N91 4 gb got disconnected during software update which cause a severe damage.i take it to a software repairer who flash it but then he replied me that the IMEI is corrupted.then i took it to some one else who installed the software eventually by flashing 2.20 008,the latest version in my N91(Rm 43) but it is switching off itself after few hours.it sometime take 1 hour, some time half hour and some time 5 hours then switch off itself.it turns on again when i turn it on and works for same period and then again switch off.could u plz help me as i am in great trouble now.what to do now to repair it.when i went to the software repairer who repaired it.he replied that its the hardware fault.i was astonished to hear this as there was no problem before repairing the software.plzzzzzzzzzzzzzzzzzzzz help.

hello,
i am having the exact same problem. however i do nott know how it occured. the phone continues to shutdown by itself every few hours. i don't know what too  do
pls help
thanks
peter

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