Garmin XPDR “No ADSB”

[BirdDog]

Hello all

 

I have a Garmin G3X system and have just recently had the XPDR replaced after it failed.  
 

the other day I was up flying and noticed it flashing up NO ADSB on the glass.  Just a couple of times but also noticed when I checked out flight aware the track ends right where the first NO ADSB error popped up.  Nothing past that point. 
 

I was above  3500 over Cootamundra area at the time. 
 

any info that could help would be greatly appreciated.