My daughter likely never uses her wall ethernet port, so I don't know if that one works solidly or not. The one near the TV I'm using to plug in an old Apple TV unit, and the kids have complained that, from time to time, they have trouble getting to Netflix. The third outlet is the one I'm using right now, with my desktop PC. On this one the connection drops periodically, and I typically recover it by unplugging the ethernet cable and plugging it back in again. It happens probably 2-3 times per hour. Usually when I come downstairs the PC internet connection is up, so that implies that when it drops it eventually recovers, even without me unplugging and re-plugging the ethernet cable.
I've tried various suggestions like changing the cable (just the part that goes from my PC to the wall plug, not the one from the switch to the wall), plugging it in a different port on the switch, disabling some energy saving advanced options in the Ethernet controller advanced settings.
I also checked the event logs to see if anything popped up, but nothing.
It is quite possible that it's the switch itself -- a very inexpensive TP-Link switch. I have zero experience with these things -- my understanding was that they are so brain-dead simple that they would rarely result in an intermittent problem like this. But maybe that's not the case.