Floodlight cam pro - video and audio issue

I have 2 floodlight pro wired cams. One out front has no issues )RSSI-55). The one out back has issues with audio and video. When I play notification videos or live view the footage appears to be in double speed. People/pets walking twice as fast but the video time itself is normal. Also the siren sound produced is a much lower pitch and slower siren compared to the front. RSSI-62 so not quite as good but still should be sufficient for data transfer. Are these video/audio issues related to Wi-Fi coverage? Or something else? Thanks