Hi,

Lately I have faced some strange behavior in one of my networks. I've tried to investigate and check few solutions but without luck and now I'm out of ideas. Maybe you could help me and suggest what else could I check/change to investigate the problem more?

Description of an issue:

Every few hours (it's not always the same period of time) the PING to web (google.com or other) is skyrocketing (500-3000ms) for like 5-10 seconds, then goes back to normal (30-50ms). During those few seconds the internet connectivity is out - pages do not load, Spotify/Youtube streaming stops. After those few seconds the Internet is back and everything works.

The problem is visible on multiple computers (Windows) as well as on mobile phones (both Android and iOS).

What I have already done/tested:

1. The problem occured the first time on a Stand Alone version of setup, with external ISP modem (double NAT) - nothing weird was visible in LOGs therefore I've decided to connect ER605 to my on-premis Controller to have direct access to device everytime I need. - That didn't change the behavior anyhow, so the problem occurs in both management scenarios.
2. I've changed DNSes from ISP's to 1.1.1.1 and 9.9.9.9 - Still the same problem.
3. I've changed echo server to custom one - 1.1.1.1 - except from lowering PING on Dashboard by few ms, the problem is still there.
4. For testing reasons, I've changed Online Detection Interval to 10s - that didn't report an connectivity issue, not even once.
5. I've deactivated L2TP (previously) and WireGuard (currently) configuration - no change.
6. I've switched modem device as well as ISP provider - in both cases the problem still occurs.
7. I've switched ISP's modem to Bridge Mode - no luck, still the same.
8. I've switched Online Detection Interval to 1h - no change.
9. Nothing in logs :(
10. This happens even if the network is not heavily occupied.

Those peaks are also (sometimes) visible on controller's graph:

My current setup:

Dynamic IP from ISP.

Local network DHCP from ER605.

No VLANs.

WireGuard configuration, where ER605 is a client.

Huawei B535-232 in Bridge Mode (ISP) <=RJ45=> ER605 <=RJ45 PoE=> EAP110 <=2.4GHz WiFi => 6 clients tops

So... Any ideas what to check next? This is not a deal breaker or anything, just annoying on a daily basis :)

Cheers!