I just replaced one of my GNSS units that failed to get gps fix as that particular device was a couple of months out of the production window for this specific failure. When I first installed the new unit it obtained a fix although with significantly weaker performance compared to my other two. After a few connects and bench testing it started to oscillate between fix and no fix and at this point in time it simply refuses to obtain a gps fix. I have been using Zubax GNSS since its first year of release and been through all the growing pains but at this point I am very disappointed in the quality control system. These have always been a cut above all other gps units i have used and I want to continue with them but others are catching up and without the same functional issues. These have been purchased through Titan.