Could you please share your computer specs? (OS version, C4D version, Corona Renderer version, CPU model, installed RAM)
If you're using a mac, have you tried updating your OS to the 11.4 or 11.5 version?
(the same thing goes for PCs, update your windows)Do you guys have other render engines installed?
Does the issue persist if you uninstall the other render engines?
Regards.