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Refresh suddenly failing with error 1326 on xp_cmdshell

The replicate and refresh jobs which have been working fine for months are suddenly getting intermittent and seemingly random error when refreshing tables.

The error message is:
Error: An error occurred during the execution of xp_cmdshell. A call to 'LogonUserW' failed with error code: '1326'.

Some tables refresh OK, but others fail with the error above, but as I said, it seems to be completely random.

Any ideas why this is suddenly occurring?
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