Memory card size does not seem to be the problem because your phone can take upto 16 GB Memory card ...Format the MC and then see if the problem persists ..
Thanks for help.
I did format its working fine now Thank Allah!
I still dont know why its acting up.
I have been using my phone to connect thru PC, do think thats the problem? What shud I do?
Bit confusing .. You mentioned that 'its working fine now' ..and the sentences below that are contradictory .. Or is there some new problem that you are facing ?
If problem remains then you may try Resetting the phone by dialing *#7370# followed by 12345 ( default code unless changed by you) when prompted. This will Format (wipe all data) the phone memory too..and will bring the phone back to Out-of-Box state.
Are you using a Good quality / reputed make MC ? Also, what Class ? Use Class 4 or 6 MC if you are not ...
...also, if you still get the problem of phone shutting down when you start the Firmware re-install..try that without the MC. Else, get the device checked at Nokia Care ..
Refer THIS for the Memory Card and Class details ..Good quality means from reputed Manufacturers..SanDisc, Kingstone and Transcend to name a few..
And the Kudos button is for appreciating / thanking the poster for a helpful post..The post need not completely solve your problem..if it does there is a SOLVED button too...
The MC seems to be Fine.. and there should not be any issues by connecting the phone to PC also but not sure about the Messenger thing.. Have you checked whether the latest Firmware is installed ? Check thru' Nokia Suite.. If update is available go for it, else, re-install the existing one. (Option available as seen in the attachment) .. Also, what Reset you have tried ? Is it Factory reset or the Soft (*#7370#) reset ?
First of all..having to do the Reset too often should not affect the phone but on the other hand should not be necessary too. Re-install the latest update and see if there is change in the behaviour. Else, you may need to visit Nokia care and get it inspected. A Firmware flash thru' them may be worth going for.
BTW, once you Reset the phone have you observed whether re-installing certain application is causing the issue ? Also use the phone without the Memory Card for a few days and see. If it works fine check with anothe MC as you have formatted the existing one already but may be still giving some issues.