After few loops - Layout Unsafe error

Windows 10, Player 256.7 - CMS 2.3.8 docker installation

Using “videoWall” solution of 2 starched displays, content is playing well for couple of loops.
then layout return to Logo with error “Layout Unsafe”
I have tried to transcode the media (3 concurrent videos) to lower bitrate (based on Core-i5) without any luck

Layout has 3 regions and content resolution match the regions:
360x480px
480x960px
2400x135px

Error: 2021-02-22 14:21:25VideoMediaElement_Loaded: 3526 Open not called after 4 seconds, marking unsafe and Expiring.

full player auditing logs:
https://1drv.ms/u/s!AiwZQTgZ6_5rjfFJcECFq172b28yzg?e=igbX1G

Downgraded to version 255.3 - this doesnt seems to happen there.
tested on 2 different PC, both produce this error on 256.7
downgrading to 255.3 - no error appear anymore - same layout, same display settings…

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