Yes, the optimization service should only restart if the CMC instructs it to (after a policy push and even then you have to explicitly tick the 'restart service' option when pushing) or an administrator clicks the restart button in the web UI or types 'restart' in the CLI.
Other unexpected service restarts might be the result of a code problem but would always be associated with log messages to that effect. You can check 'User Messages' logs to determine whether an administrator performed the restart.
To have this fully diagnosed, I would recommend opening a support case.
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Chris Geary - Riverbed Support
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