This answer applies to R4i Mk2
From experience we’ve found that this is usually due to the eject button not being pressed firmly enough, or the eject button is being pressed and held for too long. With a short firm press, CDs should eject from R4i without any problem. If this is not the case then please contact us for further assistance.
If not, please do not hesitate to contact us directly on +44 (0)1702 601410 or by using the enquiry form on our contact page.