Cubase real-time peaks

Hello,

Please make sure you have the latest drivers and Firmware installed for your MR816 interface.
http://www.steinberg.net/en/support/downloads_hardware/downloads_mr816.html

Have you been through this article?
Sometimes switching to the Legacy driver solves the problem:

https://www.steinberg.net/en/support/knowledgebase_new/show_details/kb_show/mr816-resolving-audio-performance-issues.html

Best regards,
GN