Andy, Thanks fro your reply.
I do agree it does seem like NAS1 contains the problem. What I did yesterday was to replace the network cable(again) from the router to NAS1, and now the issue has gone away, no packet loses today. But I'll keep monitoring the situation.
The strange thing is that I've replaced the cable before and that solved the issue for a couple of weeks, until the connection problem re-occurred.
It could be two faulty cables, but that does seem odd!
I haven't got an intermediate switch to try your suggest, but I'll bear that in mind.
I'll post back in a week or two, even if the problem is solved.
My Nas is Synology running a flavour of Linux
Looking at the Hub logs Port 4 keeping going down, but no package lose!
| 17:10:24, 04 Oct. | (257875.310000) Wire Lan Port 4 up |
| 17:10:21, 04 Oct. | (257872.310000) Wire Lan Port 4 down |
| 16:50:28, 04 Oct. | (256679.390000) Wire Lan Port 4 up |
| 16:50:19, 04 Oct. | (256670.310000) Wire Lan Port 4 down |
| 16:50:10, 04 Oct. | (256661.190000) Wire Lan Port 4 up |
| 16:50:07, 04 Oct. | (256658.140000) Wire Lan Port 4 down |
| 11:34:44, 04 Oct. | (237736.150000) Wire Lan Port 4 up |
| 11:34:40, 04 Oct. | (237732.830000) Wire Lan Port 4 down |
Mike