happened same in 17th.
My guess is that its a router burp, a load of packets got last at once.
Sun Apr 10 16:47:53: WARNING: Code checksum mismatch - [-1041875764] old match (PlayerName1)(xxxxxxxxx)(xxx.xxx.xxx.xxx)(sec=302)
Sun Apr 10 16:47:53: WARNING: Parameter checksum mismatch: TimeSinceRequest:120 ms (PlayerName1)(xxxxxxxxx)(xxx.xxx.xxx.xxx)(sec=302)
Sun Apr 10 16:47:53: WARNING: Level checksum mismatch (PlayerName1)(xxxxxxxxx)(xxx.xxx.xxx.xxx)(sec=302)
Sun Apr 10 16:47:53: WARNING: Code checksum mismatch - [-1041875764] old match (PlayerName2)(xxxxxxxxx)(xxx.xxx.xxx.xxx)(sec=3087)
Sun Apr 10 16:47:53: WARNING: Parameter checksum mismatch: TimeSinceRequest:530 ms (PlayerName2)(xxxxxxxxx)(xxx.xxx.xxx.xxx)(sec=3087)
Sun Apr 10 16:47:53: WARNING: Level checksum mismatch (PlayerName2)(xxxxxxxxx)(xxx.xxx.xxx.xxx)(sec=3087)
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