Hi @Edwin_D,
I am sending my current update:
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I have migrated from ZHA to Zigbee2MQTT. So far (after two days) network looks good and stable.
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All bseed switches were recognized with correct endpoints
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Basically I did exactly same automation I have used with ZHA. Honestly it seems now everything works. At this moment I am little bit afraid that issue I was getting might be caused by several factors such as unstable network due not optimized quirks or the quirk itself.
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I am about to turn off build in bluetooth and WiFi to reduce even more possible interence - I am going to use this article.
Anyway I must say I am getting used to Zigbee2MQTT and I am supprised how many features it has.
To conclude this I can say following - If the issue will persist ( for now it seems more stable than ever ) even after all of this, I will give up on build in zigbee coordinator of home assitant yellow and try some external with USB extender cable.
@Edwin_D Based on this I would like to say thank you for all your suggestions and if anything will happen I will post update here.