Duplicates Rated 2 out of 5 stars

I'm having the same issue many users have been reporting for years. I added a contact yesterday in Thunderbird. Yesterday evening my android phone got really hot, then the battery died. This morning I found that the new contact had been duplicated more than 20,000 times. My phone had died trying to sync 20,000 contacts. Also, names get randomly dropped from groups, and groups get duplicated, or sometimes deleted. I went back to the previous version, but still the problem is persisting, so today I have deleted the add-on. Too bad :-(

This review is for a previous version of the add-on (0.6.40).