MacOS 11.5.1 Cubase 11

Hi,
I recently updated to macOS 11.5.1 and immediately my ur22c stopped working.
When I open cubase (11.0.30 build 419 ) it takes minutes to start with Asio ur22c
using the integrated audio everything works just fine.
I reinstalled Yamaha drivers but nothing changes.
Any idea???
Thank you