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I have tested this unit with wireless keyboard and mouse and I did not experience any problems.
You can see at the following link the wireless keyboard and mouse that Intel tested with this Intel® NUC.
To me this sounds a compatible issue because the old Logitech wireless combo works fine with your unit except for the Rapoo 8900p.
Do you have the latest BIOS version installed? If not, you could try a bios update; you can download the latest bios version here:
Please see F7 BIOS Update Instructions for Intel® NUC
Funny you should ask, I have a replacement model Rapoo 8900 to test sitting here - arrived today!
I have also updated BIOS as you suggested.
I will let you know how it goes.
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Just installed and configured a NEW 5Ghz Rapoo 8900p Wireless Keyboard and Mouse combo on my NUC6i5-SYH.
I can happily report that there is no problem with the replacement - all works as it should.
Thank you for the information and I'm glad that this issue has been resolved, I hope you can have a better experience with the Intel unit from now on.