I have several Netgear FS728TP POE Switches which I inherited. Most of them are v1 but I have three v2. I recently added them to Smokeping to monitor latency. The three v2 switches show an avg response time of ~120 ms with values ranging from 2ms to 280ms with some packet loss. I get the same result if I monitor the switches from my desktop with Ping -t or PingPlotter. The older v1 switches show an avg of 2ms with no packet loss.
The three switches are connected the same way the other switches are using the uplink ports. One was in use, one was connected as a spare in a wiring closet but not used and the third was new out of the box. I tried connecting the third switch which was unused to multiple switches with the same result.
I contacted Netgear support and they just said it must be a hardware failure and they would replace the switch. I could not get through that it was only the new switches including a new unused one and that it was not a single switch.
I have upgraded the firmware on two of them to the current version witch did not make any difference.