@Solla-topee Thank you for your reply. Since I posted my question, I did a bit more research and have tried renaming the extended network to a different SSID name. It didn't seem to fix it at first, only if there were no clients on the extended network. I now have some (well one) client(s) on the extended network (my mobile phone, on the 2.4GHz band) and the PS4 seems to have no issue in connecting to the main router. We did try to connect the PS4 to the extended wifi with the different SSID when we were troubleshooting, but it  didn't seem to work. If the issue reappears, I will definitely try your suggestion and come back to you, but for now at least, we seem to be sorted.

 

Thanks again,

 

Arnaud

I got the same issue here with my PS4 and RE450.

I cannot connect my ps4 with the extender..

I actually bought this model, because I thought my previous extender, a TL-WA860RE v1, was faulty.

Can you please guide me through fixing the issue, please?

@am304 I've just bought a REC450 too.  To start with my PC would connect to the extender using the 5G option!! My PS4 can't even see the extender unless I reboot my PC and now that my PC is connected to the extender and my PS4 connected to the router, the PS4 keeps dropping the connecting every few minutes.

 

Starting to feel like this was a waste of money.

@Mirrodin 
I managed to make it work.
Have a look here. It is working flawlessly since then.
 

Connection between RE450 and PS4 (Again)

my ps4 can't see the 5g network and there's no way to make it look for any specific frequency

i also tried connecting the ps4 with a cat6 LAN cable which the manual says is straightforward but the connection also intermittently drops

I've sinced renamed both SSIDs which is not obvious since there are no instructions to do with and no option that explicitly says "Rename". I selected Wireless under networks then simply typed in different names in the SSID boxes. The PS4 now sees the 2G network but not the 5G. My PC sees both. If I connect PC to 5G and PS4 to 2G on the extender, the connection still drops after a few minutes. I've now had to connect the PS4 back to the router as before and only the PC is connected to the extender. I'm pretty disappointed to say the least for this kind of money. The PC's connection is now much faster and I can watch FB or Youtube without any problems but the PS4 is still getting really crappy dl, ul speeds and high latency. Technology just pees me off so much. This is sold to make you believe it works and then you find countless problems you never imagined. I have more problems now than when I started. So much for technology making life easier.