Ring door bell 3 plus

Hi I have a ring video doorbell 3 plus . It has 330mb WiFi connection with 15ms ping and 70 upload. For some reason when I try to gonto live view or answer a call I sent it just keeps buffering ? It's the same on all devices but they are all connected with brilliant speeds to the WiFi. Any one have any suggestions what I can do ,? We just paid out the the cameras etc for outside our property and its driving me mad why I can't go live or answer the doorbell on ALL DEVICES. MANY THANKS