[ChrisMarshallNY]

My experience: 95% of all network problems are dodgy cables. The other 5% is dodgy switches.

The switches one is a bear to debug. I just tossed out two old switches, because I wasn't sure which one was the one that polluted the network. I could have spent several hours, setting up little sandboxes, but it was easier just to toss them both, and get new ones.

[hypercube33]

I just retired some 3com 1900 series 1gbps switches for my home lab. Only problems I've had with them were those dell docks I mentioned corrupting arp tables requiring a full network reboot to resolve but it also could be reproduced on Cisco and Dell switches so there's that. HP still fully warranties the damn things to this day.

[bradfa]

And the final 90% is usually DNS's fault.

[ycombinete]

Finding this out the hard way at the moment. My pihole appears to cause my Orbi router to intermittently lose internet connectivity.