BF3 server R19 (903227) was released to us by DICE and we are beginning its rollout. This release is said to contain two fixes: one for a type of crash that is common mostly on high-ticket-count servers, and another to fix a crash when using 3rd-party admin tools that retrieve the banlist when it is large. It does not address the player drops related to Blaze disconnections (such as the disconnections that caused many servers to drop their players at 10pm PST on Tuesday), and it does not introduce new functionality, making it a minor release.DICE also talks about this patch a bit in a BattleLog forums post.
We are rolling the new release to servers as they empty out now. If you would like this version applied to your server before it it empties out, please try restarting the server, as this should empty it and trigger the update as long if it does not immediately re-fill. Or, if you have a managed VDS or managed dedicated machine, you can trigger a server repair through your "Managed panel" page to immediately apply the update.
We delayed this global rollout a little longer than normal while we tested the patch further; initially, there was some concern that it might be contributing to PB problems or to some other crashes. The tests ultimately came up clean.