I have spent the morning going through many of the posts in the Aria forum that appeared related to sync issues with either the original Aria or Aria 2. Although I did not see an apparent fix for those of us who have not changed their router or Wi-Fi credentials prior to the issue starting, I thought I would share a few other tidbits of information in case this applies to anyone new to this thread who isn't able to search the old posts.
The Aria uses older Wi-Fi protocols (b/g, 2.4 GHz band) so if you have a newish router that either has dual band (2.4/5 GHz) or single band 5GHz, the scale is not compatible with the 5GHz band or the newer protocols of n/ac/... For those of us who have dual band, several users found success by manually assigning the scale to the 2.4 band, our setting up the guest network function as a dedicated 2.4 band with a different SSID and pswd. Of course there are hundreds of different router models out there, so you will have to read the manual that applies to your model.
The Aria scales also use an older WPA security profile that is less secure than the more common WPA2 profile. My router has a setting to use both simultaneously so I can connect to legacy devices. The other twist is that the older scale technology doesn't support special characters or spaces in the SSID or pswd, so if you set up a guest network, only use alphanumeric characters. For those who found this to work, nobody can determine why their scale suddenly became temperamental to require this fix. Also, it may have to be repeated periodically to keep it synced properly which is another bizzare behavior.
The other popular method was to remove the scale from your account, and from the profile of any user set up to use the scale. You would then go back and add the device back in to your account following the normal setup instructions. However, be warned that some users found their scales suddenly caught in an endless loop that couldn't be stopped. Please consider the risks if your scale still measures properly since you can always manually enter your measurements manually in the app. This would basically make it a "dumb" scale since you paid for the privilege of doing the work yourself. Later tonight I will try to collect the links to the posts that I have mentioned here along with a few others.
On a side note, I noticed that in some of the earlier posts, a moderator named JuanJo appeared fairly responsive and active in the threads, but newer posts in 2020/21 have had ZERO representation from Fitbit. I also noticed that the views of posts are very high compared to actual comments posted, which suggests many more users are having isues that give up once they see the menagerie of ad-hoc fixes people have discovered on their own, not from Fitbit. As I mentioned in my previous post, I currently have a Sense, along with many other older Fitbit models, and with all the various problems the Sense continues to have since launching, moderator support is all over the threads trying to put out various fires. For me, this is the final aggravation that has convinced me to abandon Fitbit for good. I had already requested my entire data file a couple of months ago and have been setting up some Excel files to manage my data until I take some time to review the best option to import it with a new company. Loyalty to the customers who have been with them from their early days, and frankly allowed them to build the company to global prominence, means zilch to them now! Now they are only interested in monetizing your personal data, hence the purchase by Google.
