hmmm... you may be the lone straggler on an island with this. I myself have not experienced this issue and have been seriously testing this iteration for close to a month now. Perhaps more information would help....
OS - Steps to reproduce the issue (are you backfilling and they vanish? Are you just updating from today and they go away? Have you restored a mysql dump and trying to move forward, etc etc)
Your issue at this point is: My car won't start - help me fix it.