@rtchwinger Please send your logs to support@insynchq.com for investigation: How to find the log files. You can compress them before sending to save space.
@rtchwinger The logs you uploaded to Drive seem to be shared publicly. To keep it private I deleted your post.
Does the number change or is it constant at 1202? Please also try running Insync with insync start --debug 1 --no-daemon, let it run for a while, then send the output to support@insynchq.com. Include the folder ~/.config/Insync/dbs as well. You can compress them before sending to save space.
If you’ll upload them to Drive remember to not share these files publicly to protect your privacy. Please refer here on how to share files in Drive privately: https://support.google.com/drive/answer/2494822?hl=en.