@Clive_A Thanks for your reply. The SG1016PE is connected by a brand new 30cm cable, and I have tried changing the cable in previous attempts at diagnostics. But your reference to the SG1016PE being...

@Clive_A @MR.S I've been examining the ER605's events logs and this may be relevant. It seems that the switches are being intermittently disconnected from the LAN, as shown in the log extracts pasted...

No, this was just when I had the opportunity to do a test. It is hard to catch it during the disconnections as they usually only last a few minutes.

@Clive_A sorry for the delay in responding. I have not had a time to shut down other users to run the ping tests until recently. Ping test results as follows: --- 192.168.0.1 ping statistics --- 30...

@MR.S it recovered itself. No restart. Speed test tonight after this event was good, but we did have some intermittent stalled streams around 7:30pm.

I should clarify that it is not actually dropping clients. Rather, it seems to be a LAN failure. This is the current list of client uptimes showing several Ethernet connections that have been up for...