@Choggins 

If all you need from Deco mesh is WiFi coverage, I would recommend to keep Hub in router mode and switch Deco mesh to AP mode. This is how I run Deco mesh at my house with my ISP cable router.

Thanks for the reply. 

  @Choggins I'm running into a similar issue recently.  I bought 3 XE75 Pros for my home, and they were working flawlessly for many months.  Then after a firmware update, now the entire outbound internet connections are dropping out for 10 seconds to several minutes at a few times a day.  When there is higher load, the dropouts are worse.  Clearly, they broke something, and I am keeping an eye out for more firmware updates, but none have come in since.  All of my units are wired backhaul, and all of my computers are wired, with a total of 44 devices on the network.  But once my kids start gaming and I start working, and wife is watching a show, the internet starts cutting out (I've verified it is not at the modem).  This wasn't an issue a few months ago.

  @Supernat10 Hi there. This is no help to you, but since performing the troubleshooting steps I mentioned, my network is back running smoothly, I've had no dropouts at all. Still not sure which one did the trick... Good luck.

  @Choggins I have noticed a reboot helps, but the problem returns pretty soon.  I have my system setup to reboot nightly too.  Everything is fine as long as we aren't utilizing the internet "heavily" where "heavily" is subjective, because these devices are supposed to handle 200 devices on the network and 2 GB in/out, and I'm only running 44 devices (most are just smart switches/plugs which do nothing) and 1GB in/out, and we aren't even hitting bandwidth close to that when it fails.  Even so, it should never just stop working.  Slow down, sure...  I'm sitting by patiently waiting for a firmware fix.