Check to see how the quality of the video’s are on the SD card in the printer.If the video’s are fine on the sd card it may be that your problem is in the printer transmitting the video.
I had a problem that had the same symptoms you describe and it was a transmission problem. I bought an external USB Wi-Fi with an antenna and that seems to have solved my problem.
I also bought a spare wifi antenna from BL to see what it looked like along with some better antennas off of Amazon which I will I replace the exceptionally low-end stock antenna with one of the one I bought at some point