Cary 100 UV region irregular spectra

Hi all,

I have a Cary 100. When I run a scan from 800nm to 200nm, the UV region always shows irregular, strong, sharp peaks. The peaks are not repeatable if scan the same samples multiple times. I have changed the UV lamp, and done the alignment. It does not help.  The visible region is normal. Does anyone have an idea what is going on? Thanks a lot.

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