Smudging on double sided

Joined
Jun 18, 2018
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2
I have a Brother HL-5450DN. It prints perfectly when printing single sided but smudges the top of the front of each page when printing double sided. I can print the same document single sided and double sided to reproduce this problem.

If I print Document A double sided by about the 4th copy it will be virtually smudge free. If I then print document B double sided immediately afterwards then it will be smudge free. I then wait about 40 minutes and print document A immediately followed by document B (both double sided) and both have smudges.

Suggestions as to why this is and what I might do to rectify the smudging would be most welcome.
 

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