Getting notifications for sync canceled

I'm getting frequent notifications about a sync being canceled.

From my log:

[8/30/16 11:22 AM] Sources config did not change. No confign needed
[8/30/16 11:22 AM] Will prepare to sync: 2 ("<email address hidden>", "p#<email address hidden>", "<email address hidden>")
[8/30/16 11:22 AM] Account "<email address hidden>" source "2vandineorgbkuv7bnh6r8h2qhbnbk" Last status "0" Is first sync false
[8/30/16 11:22 AM] Account "<email address hidden>" source "2vandineorghfjpn0g5p2qur377b97" Last status "0" Is first sync false
[8/30/16 11:22 AM] Account "<email address hidden>" source "2vandineorgnf93tjbeilll93kk376" Last status "0" Is first sync false
[8/30/16 11:22 AM] Will sync with flags QMap(("2aj30t4pfbj4tog5d9d0jrgstgd6e2", "refresh-from-remote")("2pweather", "refresh-from-remote")("2vandineorgbkuv7bnh6r8h2qhbnbk", "two-way")("2vandineorghfjpn0g5p2qur377b97", "two-way")("2vandineorgnf93tjbeilll93kk376", "two-way"))
[8/30/16 11:22 AM] Progress 0 elapsed: 0 secs
[8/30/16 11:23 AM] Progress 0 elapsed: 5 secs
[8/30/16 11:23 AM] Progress 38 elapsed: 6 secs
[8/30/16 11:23 AM] Sync status changed to done. But source still syncing "2aj30t4pfbj4tog5d9d0jrgstgd6e2"
[8/30/16 11:23 AM] Sync status changed to done. But source still syncing "2pweather"
[8/30/16 11:23 AM] Sync status changed to done. But source still syncing "2vandineorgbkuv7bnh6r8h2qhbnbk"
[8/30/16 11:23 AM] Sync status changed to done. But source still syncing "2vandineorghfjpn0g5p2qur377b97"
[8/30/16 11:23 AM] Sync status changed to done. But source still syncing "2vandineorgnf93tjbeilll93kk376"
[8/30/16 11:23 AM] Sync Error 20017 "Sync canceled"
[8/30/16 11:23 AM] Sync error "<email address hidden>" "calendar" "Sync canceled"
[8/30/16 11:23 AM] No more job to sync.