Nokia E50-1 Issue - Lock Code

Hi guys, hope you can help me out here?!

I recently update my software to 06.41.3.0 but every so often (once a day) the phone keeps asking for ''lock code'' I can press cancel or enter it and it says code acepted. The annoying thing is my reccent call lists get erased, all logs erased and when I enter phone book it asks do i want to copy numbers on to phone again like it a new sim card which it is not!
also the settings in log says keep list for 30 days!!

Anyone else had this?

Thanks in advance
 
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