Trying to track dow and fix DtD connections failing

In the thread "VLAN Setup for Ubiquiti AirRouterHP ?" I've been having trouble with a DtD link between my Bullet M2, a AirRouter HP and a NanoStation m900.
This connection usually fails between the Bullet and the other two devices every day or two.   My house router network is connected to the Airrouter WAN port, and I have a GS105E serving the Nanostation (splitting the WAN, LAN and DtD to individual ports) and a GS108Ev3 serving the Bullet (splitting the WAN, LAN and DtD to individual ports).  the house router is connected to the WANs. The DtD ports are all connected together (I'm currently using two ports on the GS105 for DtD ports only, and one of these ports goes to the GS108Ev3 DtD port (the Bullet's) and the other goes to the Airrouter port 4 (which is configured as its Dtd port).  I suppose the pair of DtD ports belong to the Nanostation. 

Some background (I'm quoting various posts from the other thread so people not familiar can make some sense of this ?

My post of July 19th: "I've had problems with such a switch on just the DtD cables losing the DtD connections.  So far, using two ports on my air router (as described in my post above) as DtDs works better. 
Opened up the switch, a Netgear FS608v3, and sure enough it uses a Realtek chip RTL82095B.   Seems Realtek chips have problems maintaining an ethernet connection to the on-board switch when ports are being used in both a tagged and untagged mode.  Source: http://www.broadband-hamnet.org/documentation/202-dtd-linking-on-linksys.html   Is everything on the DtD link tagged?"

My post of July 20th:  "Without the switch, I still had connections on my DtD links drop.  So maybe the switch isn't the problem...  Presently my system consists of a Bullet M2, a Netgear GS108Ev3, an AirRouter HP M2 (with a 2nd DtD link added), and a NanoStation Loco M900 with a Netgear GS105E.  All their DtD ports are connected together (via the pair of DtD ports on the AirRouter), and all the WANs are connected to my home network's router.  I also have an IP camera DLink DCS-1100 connected to the Air Router's LAN.  I also have a pair of Linksys WRT54Gs in the house, but those are connected only by RF links, but they are also connected to the house router via their LANs (DHCP disabled).  They also have a DtD link between them, but not to the Ubiquiti's.  Everything has a few services on them, small web pages. 

Rebooting the Bullet didn't clear the problem, but the problem did clear after I then rebooted the NanoStation.  I don't know if only rebooting the NanoStation would have done it.  In the past, power cycling the GS108Ev2 would fix it (when I was using the switch with the Realtek chip in it). 

As a new test, I created a 2nd vlan2 port on my GS105E (the one that feeds the NanoStation) to connect the Bullet M2 to.  The other vlan2 port now goes to the DtD port 4 of the AirRouter.  Maybe the Airrouter doesn't like having two DtDs on it? "

AE6XE replys: When you added the 2nd DtDlink port on the airRouter, you might need to remove it from being part of the LAN at the same time.   We keep finding problems that the internal switches do not work when doing tagged and untagged on the same port.   ...hence why the NS M5 XW has DtDlink/WAN only on the secondary port."

I did this so this shouldn't be a problem.

My post July 21: ""As a new test, I created a 2nd vlan2 port on my GS105E (the one that feeds the NanoStation) to connect the Bullet M2 to.  The other vlan2 port now goes to the DtD port 4 of the AirRouter.  Maybe the Airrouter doesn't like having two DtDs on it? "

That wasn't it.  Tried rebooting the Airrouter, nope, The Nanostation, nope, the Bullet, nope. I rebooted the GS105E and that got the connections reestablished.  Maybe rebooting this tickled the GS108Ev3 into reestablishing the DtD link?.  Okay maybe the GS108Ev3 isn't good for serving both the Bullet's DtD, LAN and WANs along with unrelated computers also connected to WAN ports.

I'm trying to systemically narrow down to the root cause.  By trial and error, takes a while.  I've done validation at various jobs I've had, and trying to change one variable at a time..."

KG6JEI  replys: "Were starting to get off topic of this thread, a new thread would be better so everyone subscribed to this one doesn't get updates that are not related to the original post.

That said sounds like you have configuration issues going on in your environment. I've used isolated networks with mesh nodes on the same switch (v2 however) and not had any issues at all."

So this is the new thread. 

I since edited my July 21 post to add: I used the Netgear switch to split off these WANs (placed between the house router and the GS108Ev3) so the GS108Ev3 doesn't have to feed computers tied to the WAN.  The Netgear switch is now handling them, and the GS108Ev2 does not now see them.  The GS108Ev3 now only handles the Bullet's WAN,LAN and the DtD." 

Before I saw KG6JEI's reply. 

As for configuration issues, I wouldn't be surprised if I do have errors there, I'm mainly a hardware guy, and not much of a SW guy.  So  I'm trying to segment the system with isolated hardware... 

I do have a pair of Linksys WRT54Gs in the house, but they are NOT connected to the DtD link.  Only over the air, and they are connected to the house router, don't know if that could cause trouble...