@Vectorlost 

 

Things to check:

 

1. I wonder if any of your wired devices have static IP address configured on them, and occasionally PC connected to Deco 3 gets into IP address conflict (or Deco 3 does). If you have devices with static IP addresses, I would strongly recommend making for them IP address reservations on Main Deco instead. 

 

2. Next time PC goes offline, check if Deco 3 is still online. Because, if Deco 3 goes offline, too, that could mean loose Ethernet cable connection or cabling issues in general.

 

3. Also, to dismiss this as a hardware issue: swap Deco 3 and Deco 2. If that makes problem go away, you might have defective Deco unit, specifically Ethernet port(s) on Deco 3.

 

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If none of the above, I can't offer you a fix, but I can suggest workaround. The workaround would be to bypass Deco 3 in connecting PC to Netgear switch.

 

Get inexpensive 5-port gigabit switch, such as TP-Link 5 Port Gigabit Ethernet Network Switch (TL-SG1005D) which is currently available on Amazon for less than USD15. In place of Deco 3, connect that switch to Netgear GS 305, using Ethernet cable that used to connect Deco 3 to Netgear GS 305. 

Then, connect PC to TL-SG1005D. Also, connect Deco 3 to TL-SG1005D.

 

This is workaround, it does not fix an underlying problem but may help to bypass it. 

 

 

Thanks a lot @Alexandre! I'll sure test your 3 suggestions. I've also updated the Firmware to 1.5.2. I don't know if this can help too. We'll see. I'll keep monitoring and report back here on what happens :) Thanks!