Video Doorbell 3 poor picture and sound

I installed my first Ring device this weekend. (Ring Video Doorbell 3 + Ring Chime)I am surprised the poor picture (many times pixelized) quality, and the cracky sound from the device when I try to talk-back to the person standing at the door.Before you complain on the network, the Access Point is just behind the fromt door, 1.5m far from the device, and this is the ONLY device connected to that AP. Still Signal Strenght is RSSI-56 (no clue what does 56 means, if it is good or bad)Measuring Internet access it shows 100Mbps down/10Mbps up.When someone pushes the doorbell and I want to see with live view who is it, it tooks 18-20sec to show the picture.