When I first moved in I had my 8 port switch next to router running a single cable into my 5 port tp link switch and had no problems everything was running gigabit, at my previous property used same setup except the 8 port was in the living room and 5 port next to router.
When I first moved in I transferred a few files to my laptop which has gigabit and speed was amazing, then tried to 2nd desktop with gigabit and was amazing, only difference was it was direct.
I decided to get another gigabit switch as I have about 4 or 5 devices in bedroom(though not all wired up) and wanted room for any extras in future.
I put the 8 port in bedroom and new 5 port in living room.
Here is where the issues start, I tried between 2 desktops and the speed dropped almost instantly to transfer about 10 megabytes a second down to about 3 compared to almost constant 60-90 with gigabit, then today tried desktop 1 to laptop but wired direct into the 5 port next to router and it started off promising with 2 gig folder of various software, then stopped at 1 gig point, then about 2 minutes later did about 30 megabytes worth, then stopped same again etc.
Wireless is disabled so it cant be that.
Just wonder if my newer switch is a piece of junk? Could plugging it into a surge protector be affecting it?