@Mark-R Thanks for the info/suggestions/discussion/etc!  My setup is only ethernet back haul.  With my old Orbi setup restored, I no longer have any issues. I had an older ASUS mesh setup prior (it had a terrible mesh solution - but in their defense it wasn't their latest MESH solution - unfortunately the experience was so terrible that I don't want to risk their newer solutions).  But seemless handoff issues aside, the ASUS system was rock solid as far as overall network staying up.   So its hard to believe there is something "wrong" with my setup for the Deco solution to hiccup (only a second to a few seconds) so frequently during the day.  Could it really be my AT&T fiber ISP losing connections for split seconds (perhaps the ASUS or Negear simply "ignore" these hiccups and that's why everything appears to be stable) and throwing the Deco into port sensing mode?!

Anyway, I left all my Deco setting as is - so if there is a firmeware update/fix in the future, I can easily swap it back in for a weekend or so to test.  But until there is a fix (this thread is 3+ years old?!), I'm going to stick with my "slowish" Netgear Orbi! 

  @TP-Link 

Are there any progress on this issue. I got X50-4G, and using it as wifi-router, with my fibre connection as primary WAN and 4G as backup. When my fibre drops out, it uses 4G to provide, but it drops both my wired satellite and my 16 port switch, and only provides wifi enabled devices. Seing as Fixed WAN port already exists on other similar deco devices, this should be implemented on the rest of them.

I'm loving both my X50-4G as main router, and both my satellites (X50 and X50-Outdoor), but this simple issue makes me considering switching the setup, even if I'm really happy with the rest of it.

  @Vang1 I thought that was already an option on x50-4g?

I've not got mine set as primary at the moment so can't check, but could swear there was a setting to specify the wan port it listens to in order to flip to 4g? Does that not force the other 2 to lan? Seems a huge oversight if not!

  @C0deape 

Sadly, I haven't found that setting. It's not under Advanced, not under Offline Detection  or anywhere else that I can find.

It's strange, as X20 or X80 with cell backup got that setting, but not X50 does not, witch just doesn't make sense. And since other models already have it, it should be relatively easy to fix.

@TP-Link 

@David-TP 

X50-4G needs an option to chose fixed Wan port.

  @TP-Link Please add the Deco BE63 to this list of supported devices for More > Advanced > WAN Port settings shown in the "How to set a fixed WAN Port on your Deco" article (https://www.tp-link.com/ca/support/faq/4252/).

  @TP-Link 

why do yall release updates for very old deco equipment, but when I reach out to have this done on the top of the line routers, like the WiFi 7 decos, the fact that yall would support old devices but not give us ppl who spent thousands that same option, its time for me to return yalls equpand go to netgear, because it's obvious yall don't care about us customers who spent over $1200 for a mesh system, netgear don't have this issue, this is a yall issue and since yall told me yall would update this in June of this year and still nothing is proof yall don't care about the customers who really spend money, this fixed wan port should of been rolled out to the high end devices first! Not old equipment like the W6000! Yall are horrible

  @TP-Link 

also, why are only WiFi 6, the cheapest yall have able to have this option, but if u have a 6E or 7 router, we are overlooked, although we spent way way more money! Yall have failed y'all's customers, I would advise anyone looking into a deco unit to steer clear! They will tell you they will fix it with a upgraded firmware, but only release it to the lower end models is a slap to the face to the ones that spent thousands on this garbage! I was told the BE85 would have the upgrade by June this year, it's now November and nothing, yall are absolutely horrible, I want a refund point blank!

Just a lie, so you pass the return period! Yall had no plans to fix it in June, it was just a lie so I didn't return y'all's garbage!