Yes.... very much suspect it is related to this.
I have PAW and ADS-B out. My ADSB out (Trig TT21) is fed by a separate Garmin GPS unit, not PAW. So yes they are totally independent.
I really should update the PAW GPS dongle, because the one I have looses its marbles sometimes.. It was even mis-reporting my altitude, once by approximately 4,000ft!
FWIW maybe if we have an ADSB out facility, we should be able to switch off PAW TX and only Receive PAW...... Thus relying on ADSB-out only if available. AFAIK PAW doesn't rely on packet acknowledgments, it just receives and decodes what it gets without providing an ACK.
Cheers
Andy