After installing beta firmware 188.8.131.52, I am still experiencing an issue where recording 1 minute of previously saved (SD card) nighttime footage results in a 52 second clip, and the video is sped up even faster still - playing through its entirety in just 40 seconds. I do not notice this behavior when recording a daytime video. I have 4 WyzeCam v2 devices, and have observed this with at least 2 of them. This was tested using WiFi and cellular LTE.
After this experiment, I pulled the SD card from one of the cameras and did not have these inconsistencies with the raw files.
I currently am using the following:
WyzeCam v2 firmware 184.108.40.206
WyzeCam Android App (Beta) 1.4.18
Samsung Galaxy S8+ (Sprint)