4k video stutters on mi box s

[Maciejuszko]

I think the WiFi signal is enough, as I can stream HBO & Netflix 4k with no issue on Mi Box.
I have transcoded the Fallout episode to the same file format just lower bitrate - from 11196kbps to 7297kbps. The playback still stutters.

I also tried to playback another movie in 4k:

Indiana Jones And The Last Crusade (1989)
Container: mkv
Path: /Volumes/SSDWD 1TB-1/Filmy HD/Indiana Jones And The Last Crusade (1989).mkv
Size: 6155 MB

Video
Title: 4K HEVC SDR
Codec: HEVC
AVC: No
Profile: Main 10
Level: 150
Resolution: 3840x1632
Aspect ratio: 2.35:1
Anamorphic: No
Interlaced: No
Framerate: 23.976025
Bitrate: 6781 kbps
Bit depth: 10 bit
Video range: SDR
Video range type: SDR
Pixel format: yuv420p10le
Ref frames: 1

Audio
Title: English - AAC - 5.1
Language: eng
Codec: AAC
AVC: No
Profile: LC
Layout: 5.1
Channels: 6 ch
Bitrate: 476 kbps
Sample rate: 48000 Hz
Default: No
Forced: No
External: No

Despite the almost similar bitrates, this one does not stutter at all.