MC60 accuracy (All in one)

Hi everyone . I have a problem with the MC60 accuracy. (All in one & open cpu) :
When I turn on the GNSS module, the accuracy of the first point is about 30-200 meters or more and it takes about 50 seconds.
after that , it takes about 30 seconds for the accuracy to reach below 10 meters (relative to the actual coordinates).
The number of satellites is from 5 to 18 (sometimes, with more than 10 satellites, the accuracy is between 50 and 100 meters) a lithium ion battery is constantly connected to the module, and RTC pin is float.
The circuit has a suitable antenna as well as a filter and LAN.and GLP is off.
How can I reduce this 30 seconds ?