Lost my Streak because the app didn't sync with my internet.
I tried the new "coach" feature on Duolingo online for 30 XP, and I did 2 lessons on my phone online, and one offline. I forgot to sync my app on that day, so the 10 XP that I earned offline on that day went for the day after that because I forgot to open the app when I was online again. That wouldn't of been much of a problem if I didn't lose my 87 day streak because of that.
Maybe a solution for that is to sync Duolingo in the background (for the app) so you if you forget to open the app when you're online again, it won't be a problem.
Lastly, could you reset my streak? I've been really proud of that for a student.