As if the problem persists
Save it like you mean it, like you’re having problems all the time.
From
English (United States)
English (United States)

Document not saved. Please save as if problem persists.
To

Document not saved. Please save like when the problem persists.
The original string is ambiguous to begin with. It should have at least indicate “Save as…” as the action name.
Document not saved. Please “Save as…” if problem persists.