Sync failure with "Unknown error" in bottom bar and " h2 Client sent a bad request /h2 " in sync log

For about two days all my devices have been failing to sync, with "Unknown error" in the bottom bar, and errors like this in the sync logs:
<pre><nowiki>1366935522699 Sync.Tracker.History DEBUG Saving changed IDs to history
1366935524160 Sync.Collection DEBUG mesg: POST success 200 https://phx-sync500.services.mozilla.com/1.1/zackw/storage/history
1366935524160 Sync.Collection DEBUG POST success 200 https://phx-sync500.services.mozilla.com/1.1/zackw/storage/history
1366935524544 Sync.Engine.History INFO Uploading 100 - 200 out of 643 records
1366935524547 Sync.Collection DEBUG POST Length: 53358
1366935525789 Sync.Collection DEBUG mesg: POST success 200 https://phx-sync500.services.mozilla.com/1.1/zackw/storage/history
1366935525789 Sync.Collection DEBUG POST success 200 https://phx-sync500.services.mozilla.com/1.1/zackw/storage/history
1366935525981 Sync.Engine.History INFO Uploading 200 - 300 out of 643 records
1366935525985 Sync.Collection DEBUG POST Length: 48900
1366935527259 Sync.Collection DEBUG mesg: POST success 200 https://phx-sync500.services.mozilla.com/1.1/zackw/storage/history
1366935527259 Sync.Collection DEBUG POST success 200 https://phx-sync500.services.mozilla.com/1.1/zackw/storage/history
1366935527654 Sync.Engine.History INFO Uploading 300 - 400 out of 643 records
1366935527657 Sync.Collection DEBUG POST Length: 47409
1366935527786 Sync.Collection DEBUG mesg: POST fail 400 https://phx-sync500.services.mozilla.com/1.1/zackw/storage/history
1366935527786 Sync.Collection DEBUG POST fail 400 https://phx-sync500.services.mozilla.com/1.1/zackw/storage/history
1366935527786 Sync.Engine.History DEBUG Uploading records failed: <h2>Client sent a bad request.</h2>
1366935527795 Sync.Status DEBUG Status for engine history: error.engine.reason.record_upload_fail
1366935527795 Sync.Status DEBUG Status.service: success.status_ok => error.sync.failed_partial
1366935527795 Sync.ErrorHandler DEBUG history failed: <h2>Client sent a bad request.</h2>
No traceback available
1366935527795 Sync.Synchronizer INFO Sync completed at 2013-04-25 20:18:47 after 14.18 secs.
1366935527795 Sync.SyncScheduler DEBUG Next sync in 600000 ms.
1366935527796 Sync.ErrorHandler DEBUG Some engines did not sync correctly.</nowiki></pre>

They are having sync server issues for the past few days.
https://services.mozilla.com/status/
https://twitter.com/mozservices
'''''Mozilla Services ‏@mozservices 26m'''''
'''''Sorry folks, we're still experiencing some intermittent server/hardware issues with sync. We really do appreciate your patience!'''''

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