Poor GPS (HUAWEI Y6 2017)

Hi. I have recently bought a HUAWEI Y6 2017 smartphone (MediaTek ΜΤ6737Τ). The GPS signal is very poor. I have tried many applications from google play (like gps fix, fps lock, gps test
and others) to improve the gps signal and to lock some satellites and other android settings but nothing. It is not working properly. When i am driving my car, the gps lost the signal
and give me wrong driving details. So, I can't use it. The smartphone is not rooted, and I don't want to root it (to try applications like MKT engineer tools) because I will lost the
warranty. Do you have any suggestions to try? Thank you in advance!