The GPS connection might stop to work in the current version of Nokia E75 if MAPS 3.x is installed on your device before you upgrade firmware to version 202.12.1.
To repair do either the factory reset or download and reinstall MAPS 3.03 software from Nokia web site.
Factory reset: Menu > Ctrl. panel > Settings > General > Factory Settings. The default lock code is 12345, if you have not changed it your own.