On Sunday April 28th, 2019 I did a long ride on Zwift. It was cold and raining outside so I elected to ride Zwift. I was following a workout which was 4:15 long. At about the 1:30 mark things started getting flaky. First, the other riders on course showed with no names in the riders nearby listing. They were all listed but the names, countries, stats were missing. I knew something was up but I kept pushing through because I was determined to finish the workout in one shot and not stop to troubleshoot or break it up.
Sometime later in the ride all the other riders disappeared completely. I was the only one on course. Incidentally, I ended up with two course jerseys because I was the only rider which I did not really “earn”. I completed the ride and achieved a few real milestones like level 15 and the metric century badge.
When I saved the activity at the end, it did not upload to Strava/Training Peaks/Garmin. When I checked the Zwift Companion app the ride showed as only 1:30 long with the warning “Activity details could not be loaded”. I manually found the .fit file and uploaded it to the other sites and it worked so I at least got credit there. But it is frustrating to lose the level up and the metric century because 4+ hours on a trainer is not much fun!
I assume this was some kind of network issue but my network seemed to be working well. I did a Speedtest when I finished and all was normal (~120Mbps cable connection). I have never had network issues in the past. I run Zwift on a PC using WiFi (802.11ac) and which has always been stable throughout my home. I rebooted the computer the same day and restarted Zwift and all was running fine. I have since done another training session this week for 1 hour and it worked fine.
I just wanted to reach out to the community and see if there were any suggestions on what the issue might be and if there is anything I should investigate to potentially avoid a recurrence. I ran the log file through Zwiftalizer and the results are attached below. The plot looks strange to me. The network issue seem to correlate to the timing of the rider issues (first no names, then no riders).
Has anyone seen anything like this? Any suggestions?