won't find satellites

I have a nokia 5800 I downloaded race chrono to I bought an external Bluetooth gps a nokia ld-3w sometimes it links to my phone and when it does works really well but more often than not it keeps saying no fix to satellites the problem I also have is if I do have lock on satellites it drops out when I pause session then won't re plot itself recently in jerez it didn't connect all week any ideas on what to do or is this not the correct receiver to use.
thanks
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