Seems like a bad software theme when I can't even post the log here because 'Content or title contains illegal external links.'

Appears the support is as good as the devices

  @worstntwrkever 

What 'flood table' is, and where do you see this table in Deco app or elsewhere?

What does "Devices are constantly getting kicks off of the network" mean, in details? How do you recover device from that condition (from disconnect) or does it recover on its own?

Providing network diagram is also helpful. If there are switches through which Satellite Deco connect - their brand, model.

Clarifying if problematic devices connect to Main, Guest or IoT Network is useful.

Specifying how that Network is configured (dual band, security, etc.) is a must.

Does Deco mesh run in default Router or in Access Point mode.

You are saying you work in IT. Look at your original post as an escalation to IT Support at your place of work and ask yourself if it does provide enough information.

I won't promise resolution or workarounds, but you should be starting with detailed problem description to expect anything. Unless you are just venting your frustration before packing Deco hardware and sending it back to retailer for refund. Then, never mind.

Also, thanks for not posting logs, unless they are curated and only have relevant info. Nothing more annoying than to scroll through pages after pages of irrelevant log lines. You must know that feeling if you work in IT and spend time troubleshooting other people problems.

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About my Deco mesh. 

Consists of M9 Plus and M5 nodes.

Runs in Access Point mode.

Guest Network is set as single band 2.4 GHz. M9 Plus doesn't have IoT Network option, using Guest Network as a substitute.

Three Kasa smart plugs HS103 connected to Guest Network. Connection is stable.

TP-Link Home Security Wi-Fi Camera C225 also connects to Guest Network. Streams 24/7 in HD, stable connection.

  @Alexandre.

Thank you for you reply.

Devices are inaccessable even though the devices themselves is not showing any wifi connection issues.  To regain access I need to reset the device. this happens with many devices including Kasa switches, plugs and lights as well as ESP devices. Seems to be isolated to the 2.4G network as this is where all of these IoT devices connect to. Decos are in AP mode, I was getting even more connection issues when in router mode. Doesn't seem to matter if they are on the main, IoT or Guest network, all get disconnections. Enryption is WPA Personal.

  @David-TP 

All Decos are connected directly to eachother via ethernet. I don't typically used Deco app for smart device control. I use Home assistant for control of these devices and it frequently shows the devices offline. When I check these devices in the Kasa app, they are also unavailable. I have ~40 Kasa devices and ~30 ESP devices on the 2.4G network, all of which loose connection. 

  @David-TP 

What are these 'further optimizations' that I can apply to make Deco's work as they should?

I have an almost identical configuration (same router, similar devices, with 23 IoT devices mainly Kasa). 
 

I'm also having similar issues and have opened a ticket. The initial ticket response was to install an old firmware which didn't install. I'm curious what the optimizations are as there are very few options that I believe would help and have already turned them all off. 
 

Given that first line support tried to get me to do a firmware update of a previous version it leads me to believe this is a hardware or firmware issue. 
 

The one thing that I did notice is that my SSID for my IoT network seems to not be found occasionally. So I'm wondering if the IoT network is actually unavailable which is why I have low number of successful connections.