UK Ring Video Doorbell Pro - Black Screen Recording

It connects to a TP-Link Mesh network and has been working fine. Internet speed is around 60 Mbps. I can view live view with no issues at all. Motion detection also records video without any issues. The problem is actuall events where the doorbell is pressed. The video is then just a black screen for the period of time it records. I understand this is somethimes due to slow upload speeds but as mentioned the live view and motion detection recording are not affected. Anyone heard of this issue?