@darko116,
Have you found solution. If it's any consolation i had the same issue on Falk F5 and NavGear GT-43T-3D. iGO8 works great fix is very fast, Nextgen works also great (gps wise) fix is also very fast. Primo no matter the version is always same. It finds GPS sattelites some of them are green but no lock on them, also no information below that on time, connection quality as it is shown on other models.
Really strange, i tried i think everything but never found solution or reason of this issue.