@dazmatic 

i had somewhat similar problem earlier when VPN was enabled. L2TP /PPTP or site to site, every time there was a  connect or reconnect of the vpn there were problems with teams and the the company VPN on the PC lost connection, I spent a long time getting tp-link to understand the problem but after a couple of months they fixed it. I don't think it's fixed if you use PPTP on the router. so if you have any VPN activated try to compare when it happens and VPN connect or disconnect in the log.

You will find this log under event and device

So I've since set up ping plotter to rule out various devices and interfaces. So far, the main candidate is the ER605 currently sat on the local IP in the screenshots below.

This then gets really, really weird. The red bars are obviously packet loss and whilst the duration of packet loss is slightly different, the time of the packet loss cannot be a coincidence. 31 minutes past, 34 minutes past and 36 minutes past the hour almost to the second every time.

Hi  @Hank21 

My setup is pretty straightforward out of the box settings.

Other than changing the LAN1 address, changing the DHCP pool, setting up WAN interfaces and opening a couple of ports for services, it is pretty much standard.

There are no VLANs, no VPNs - there was one ACL I setup for MS Teams calls as that was how I initially noticed the first issue before the packet loss monitoring began.

I've since swapped out the ER605 with an old Draytek 2860 and the packet loss has stopped.

In terms of layout, I've got just 2 EAP WALL access points, and a single managed POE switch to power them. The tests have been done over ethernet but the issue is also apparent on WiFi.

Also the tests were done pinging the ER605 whilst also pinging a couple of online services (Google and ms.teams) and the timings of packet loss online coincided with packet loss to the ER605.

Also, I have been monitoring pings to intermediate hops on my network between the test system and the ER605 and there has been no packet loss. 

Hi @Hank21 

I've since factory reset the ER605 unit and set it up again - without the controller.

Setup included setting PW etc, DHCP reservations and pool and WAN connections - nothing else has been changed and the packet loss has now returned, albeit around 1 minute later than previously.

Wired client  @Hank21 

literally happening every hour. (2am was a restart)

This is from a fresh factory reset too with minimal settings changed and please note, my draytek 2860 tested in same location did not have this issue.

  @Hank21 

Can you please confirm that a report can be built from Parker detailing the outcome?