Hello guys, it's a pleasure to provide assistance with your syncing difficulties but first let me give you a warm welcome to the Community Forums @chrisry @David43.
Seems odd that your Ionic devices suddenly stop syncing your daily stats. I recommend to check our help article: How do Fitbit devices sync their data? for more information and to check if there's a missing requirement that's affecting the syncing procedure. Then, please move to the troubleshooting steps specified on: Why won't my Fitbit device sync? and let me know how it goes.
I'll be around if further assistance is required.
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