This issue can occur due to the presence of Cisco bug ID CSCse46220.
This problem occurs as ASA attempts to re-order all packets matched in the access-list of the associated class.
In order to resolve this issue, complete these steps:
Adjust the access-list reference in the class-map command in order to remove the problem traffic from inspection by the SSM.
Increase the queue-limit under the tcp-map command. This can help with performance, although it can take some trial and error in order to find the optimal queue-limit value that delivers the best performance.
Clear the selective-ack and timestamp options from the tcp-options command.
This is an example of an adjusted queue-limit with cleared selective-ack and timestamp options:
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