1gb connection keeps dropping to outbuilding (Ethernet laid)

40/50Mbps would be the expected speed for a Wi-Fi device on the 2.4GHz band.

You mentioned the Ethernet cable to the outbuilding, but once in the outbuilding what is on the end of that cable? 

I.E. what make and model of Wi-Fi Access Point or Wi-Fi Router etc
is providing the Wi-Fi service to the devices in the outbuilding ? 

There is a possibility that there is a problem with the cable, not all 8 wires connected or some making an intermittent connection. You really need to test the cable with a tester, they are very cheap on Amazon etc. if it’s not the cable then we need to look further, but this is the first step.

As per Tudor, investigate the cable and terminations and patch leads first of all.

Does the cable run in one continuous length from the hub location to the outbuilding?

I watched a YT video a little while ago showing an electrician using multiple cable joins and telephone crimps to install an ethernet connection to an outbuilding

https://youtu.be/R3Cgc3TQjuY?t=1852

This will show continuity of connection using a simple cable tester but the way it is joined will mean the cable is likely to give a poor quality connection (speed and reliability are likely to be below spec because of this method)

Hey Craig_M86, thank you for reaching out and a warm welcome to the community, we are sorry to hear you are having some connection issues.

We've taken a look at our side and the connection looks great, all your levels are great.

Can you try with the VPN to see if this makes a difference? 

Get a better router with 1Gb ports and use hub in modem mode then see if that fixes it 

Thanks for all the suggestions so far.

I’ve tested the Ethernet cable and that’s working as expected. 

I have a Tp-link 5 port switch (TL-SG105E) that is connected to the cable running from the router, into that I have a BT whole home WiFi disc which provides the WiFi connection. The issue is occurring when a laptop is physically connected to either the switch or via WiFi, it doesn't seem to lose internet connection but will drop a VPN (used for work purposes) connection. Like I mentioned this only occurs in the outbuilding (more of a shed tbh!) and isn’t an issue when connected to the Hub5 indoors.

Wifi speed wise I’m getting around 600mbps download (not sure what happened to the other 400 I pay for mind you…) from the WiFi disc.

At a bit of a loss as it’s only dropping VPN connections out

So I've now unplugged the Wi-Fi and the switch and am directly plugged into the Ethernet port that runs direct from the Hub 5. I'll see how this goes over the next couple of days.

Instead of a switch & wifi pod do you think it would be best to get a new router with multiple ports on the back for out here, just thinking the less 'things' I have wired up the less the likelihood of one of them causing an issue. If so, what would people recommend to do the job?