Thanks for posting to let us know that you're still having trouble with on off connection after reboot, I can appreciate some frustration may be caused by this so apologies for any inconvenience caused.
I've tested your equipment's stats and also the area cable and I've noticed that your Hubs SNR (Signal to Noise Ratio) levels are out of the preferred range.
In order to resolve this we would need to arrange for an engineer to visit and make the necessary adjustments, I will send you a PM (blue envelop at the top right hand corner) it would be great if you could reply to me there and I'll get this all booked and secured for you.
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The tech who swapped my SH2 for a SH2ac also said the SNR was too low, and that he was going to talk with the Network Manager about it. No response from him though. Then John_G popped up 3 weeks and said SNR was "within spec" and closed the fault.
The fault has been absent for a couple of days, but the Network log is filling up with "CSRF Detect - Expired Content Submitted ; LAN Interface" ? ? ?
I never turn my hub off but I occasionally reboot it and have noticed a similar problem recently. One of the upstream channels constantly shows "success" followed by "Timeout T4" for about an hour after each reboot. After that it settles down and is completely fine until the next reboot.