@MarcelPk 

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Update 4-12-2023

I exchanged the main Deco M5 with a new one - same effect. After 30 mins to 7 days - the modem-router ethernet ports freeze.

Anyone from TP-Link can give me an idea what to do here? @David-TP ? 

Marcel

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Update 21-12-2023

Changed the internet modem to an Arris TG2492 - here the same thing happens again.

Does anyone have the same problem? I.e. plain simple - 1 Deco direct on ethernet port of modem, configured as AP.

On one other ethernet port of the modem just a laptop connected via utp.And then after a few minutes to hours - it freezes the modem, as if there is a loop in the network, which there is not.

  @MarcelPk 

I have setup similar to yours, but mine does not cause any issues.

Deco mesh runs in AP mode.

DOCSIS cable modem/router CGM4331COM from Technicolor.

Satellite Deco M5 connected directly to cable router Ethernet port.

NAS connected to another Ethernet port of router.

8-port gigabit switch connected to third Ethernet port of router.

All Ethernet ports of that switch are occupied, including two hardwired Deco units: another Satellite M5 and Main M9 Plus. Also, desktops and laptop are connected to that switch.

Have been running this home network configuration for 2+ years without issues. 

Technicolor modem is recent replacement by ISP. Before, it were Hitron CODA DOCSIS modem with four Ethernet ports. I had no issues with it as well.