A lot of people including myself run into this issue of frame rate consistency with Zidoo family of players using RTD 1295 chipset. It appears that new chipset RTD 1296 is also effected the same way. This small blip in motion or micro-stutter as some people call it is caused by double (repeated frame) looking like the movie was paused for split second. It effects all high quality videos 4K HDR and HD with high bitrate and 23.976fps. You can see it on average 4 to 6 times in one movie but it looks like the issue is cycling every 4 to 5 minutes but only noticeable during panning scenes. Original post here. Couple of examples captured in slow motion at 120fps. Watch the man in the background as he is passing corner of the fireplace. The entire scene pauses for one additional frame cycle. Panning camera over the table in the middle of the sweep repeated frame. Another issue is strong stutter lasting about a second during playback of low bitrate videos 4.5Mbps L:4.0 23.976fps. Full article here. Both issues appear to be caused by 23.976fps played at 23.98Hz but unconfirmed at this point. Looking for comments from Zidoo team. Can this be fixed in Zidoo player software? Some people reported good smooth playback with earlier firmware versions 1.5 for X9S player. There were also reports that the issue was fixed on Dune player with the same RTD 1295 chip. =============================================================== Update Jan. 19th 2019 I appears that new firmware v2.1.22 corrected both stutter issues on X9S player. Great job Zidoo.