How often have you gotten ??? and how often has it resolved itself.
Also, how often does your receiver miss a reading (no backfill on G5 receiver)?
My first day, I had 4 missed data points.
Yesterday, I got my first “???” for about 15 minutes, got some accurate numbers for a short time, and then permanent “???”.
Sensor wasn’t loose, and had given very accurate readings for many days prior to the ???