Hi all,

Recently got an ER605W and am having some unusual connection issues.
It has been set it up with a fairly basic out of the box configuration, identical 2.4G and 5G wireless networks, one LAN with no VLAN. I’ve also got a Linux server running PiHole and a couple of other services at a static IP out of the DHCP pool. The DNS on the ER605W is set to one one one one, with devices using PiHole set on the individual devices.
There is an intermittent issue being experienced by wireless clients (multiple iPhones, iPad, Windows devices; mix of both using standard DNS and PiHole) where web pages will not load. On iPhone the progress bar will load about 15% then stop. If an iPhone is disconnected from wifi and a 4g connection is used to load a web page, then wifi is turned back on, the page will then reload normally on wifi, however other pages will still not load.
This points to a DNS issue, however affected devices cannot load pages when an IP is used instead of a domain, and they also cannot connect to the internal Linux server by IP, nor ping it. They can however connect to the ER605W, which can ping both the internet and the Linux server from the diagnostics menu. I have not noticed any of the issues on a hardwired Windows PC.

The issue seems to fix itself after a random amount of time (minutes, hours) so I am baffled about what it could be - would love to hear any suggestions. Thanks!