My educated guess would be it's because Internet (download) traffic tends to have lots of reply packets going the other direction - very much unlike local throughput benchmarks that tend to load one...

I've been through all this. First I swapped the 8030P V1 for 8030P V2, which made things better but not good - I still had one or two connection losses per day on the upstairs office PC. Also,...

PLC Connection drops are nothing to do with anything the attached devices do. PLC units are supposed to go to standby whenever none of their local LAN ports have a connection. They should never go on...

At 400 Mbit/s bandwidth, you should expect to get about 133 Mbit/s, which translates to about 15 MBytes/s. As it always is with physics and math, please watch your units.

See above - check the physical connection bandwidth (using tpPLC utility software) and do the math. Something is wrong only if either the connection bandwidth or the payload throughput are much lower...

That's just as much as you can expect to get from AV500 kit. Here's the math: Similar to all other shared-media network transports (like WLAN), payload throughput will be about a third of the...