Reasons could be many, but the software is usually the smallest culprit.
Antenna, cable, connector, receiver in the unit...unit itself.
Chinese devices are generic, Primo Civic usually works great with them.
And to test the software - always uses a clean edition without any add-ons.
Take new SD card, put clean package, with generic sys, minimal, end see what is happening. If it still has a problem, try with Primo 2.0 (KIA) and even try with ordinary iGO8.
The only item you can change in sys is port and baud rate. First leave it to auto values, then manually change (fix) them and see if there is any difference.
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