Instinct solar lost all todays activity data yet again!

Sounds like you've got some corrupt fit files. If you're getting errors when doing a manual upload to Garmin Connect, we can try to help repair those for you, if you like.

The activities were on the watch as the history allowed me to check the details.  Since the last sync they are no longer there but the previous days activities are.  I will plug watch into PC to see what FIT files are in the folder.  I tried this with the IPad but that doesn’t see the file structure on watch. 

You can try a manual upload of your activity to Garmin Connect - How Do I Manually Upload an Activity I Recorded to Garmin Connect?

If you get any message other than Import Complete, then there is a problem with the file. Attach it to this thread. We can take a look to see if it is repairable.

• Zip the file, then in a reply post Insert >> Image/video/file >> click Upload >> browse for file >> OK.
• Or upload the fit file to a file sharing service, such as OneDrive, Google Drive, Dropbox, etc., make the file public, then paste a link to the file in your post.

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Thanks for the reply! 
I have tried that today connecting watch to IPad  whilst Garmin connect web was loaded.  The IPad can’t see the watches file structure. I will retry on the PC tomorrow. 

Checked watch files on PC and there are no FIT activity files.  
How can I find out what the direct cause is, watch firmware or Garmin connect?