GPS and PX4

Hi everyone, fisrst of all, sorry for my english.

I have rare problem with my gps ubox m8n and my Pixhawk PX4.

The problem is that when I connect the Pixhawk by usb, the gps position works perfectly (16 sats 0,7 hdop), but when I plug the battery and connect the Pixhawk by telemetry, the gps starts working very bad (7 sats 1.5/2.5 hdop), and it´s imposible to fly.

Any help would be great, thanks!

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