@Murtaza911 

Appreciate your reply and update.

I still support these routers are decent hardware, let down by poor firmware. All I've asked support for, and @David-TP is an update, whether directly back to me via email, or also via this threat, which will help others, what TP Link are doing about this and when we all could expect firmware to resolve these issues. I do not believe this is an unreasonable request. I also appreciate, not everybody maybe having these same issues, or, customers believe the issue is elsewhere in their set up, and not the router.

I still am not able to use my Bose soundbar as the app will not 'see' my soundbar via the Bose app, yet the Deco app displays that it is connected. I haven't organised a time for the engineer to remote into my set up, as I'm under going tests for a heath concern; and finding a suitable time isn't easy. I have supplied however numerous router logs, which I hope will help them.

  @ARGamingPK1 

No I have not. And I don't plan to as that would not affect my issue in any way. 
 

I've noticed a lot of your suggestions are ignoring the details in my initial post and all responses up until this point. 

The wifi flapping issues that I am having and others are having is strictly a firmware issue. It is how the deco handles devices and steering.   This is not a settings issue, as by this point all troubleshooting has been done.   
 

The only fix is a firmware update to address this... or have a tp link engineer remote in to every customer and fix it one by one (which is very unrealistic). 

I did some testing after reading the last comment, and found that changing the setting in Deco to force my laptop to the 5 GHz network only greatly increased stability. It still drops a few packets here and there and isn't fully stable, but it's stable enough that it's not completely disconnecting a few times per hour. Ultimately it should still be much better than this, but this helps as a temporary workaround.

@David-TP you would kindly update this thread on what the next steps are from TP Link in regards to this firmware issues? I do not want to be a pain, I just want a working network.

  @David-TP just to be clear, my issue is not fixed. I found a workaround that mostly works. It involved setting the Wi-Fi band manually for each of about 80 devices on my network, and also setting which Deco unit they connect to for the ones that don't roam.

There seems to be some major issue in the Deco firmware around negotiating which band and which unit they connect to. I have some devices that, before I changed the setting, they would regularly connect to a Deco unit across the house instead of the one right next to them. 

To be clear, this has made the connections much more stable, but this shouldn't have been necessary and there is still an issue. The Wi-Fi connection still gets lossy under load, way more than it should, and there is a disconnect from the Wi-Fi for most devices a couple times an hour still.

I have not updated. I'm still on the last stable release 1.1.3 or whatever. I don't really want to agree to the beta terms, and I don't want to switch to a version that has additional issues that I can't back out of.

This should be high priority for TP-Link because the average user will definitely not be able to troubleshoot like I have and I shouldn't have to find my own workaround to basic features.

  @David-TP 

That's actually not true.  I'm still getting device flapping.   It's much less than before but it is definitely still there and super annoying.  And the firmware update isn't what helped, it didn't do any thing to help at all. 
what helped was having the support engineer remote in and manually make things work.

I still need to schedule another session with him to address the remaining disconnects.  I've been making a list of the devices that are disconnecting. 

@David-TP 

I support the previous 2 thread posts, the firmware is still a problem, and TP Link hasn't resolved issues specifically with your firmware. While others may have the BE65 Pro, and mine is the BE65 v2, the underlying code and hardware is probably similar. I can say, the issue being felt by most users are very similar, and I feel for those who are not so tech savvy and not able to fault find like a few of us.

My Deco's crashed again yesterday, and magically upon booting themselves back up, my Bose Soundbar is now discoverable by the Bose app. All other concerns I have made known remain outstanding and unresolved.

Sadly, I have attempted twice to schedule a remote session with a TP Link Engineer and I have had no response from TP Link.