Resolved my issues possibly
I had a issue where my wireless connection would drop out and not be able to reconnect, but wired PC's remained connected to the internet but I couldn't access the admin (192.168.1.1) for the router.
I sent one back to Amazon with this problem, got another back (which I'm still using) but that had exactly the same problem after a while!
We transfered to a new ISP and they actually gave us a fairly decent router so we used that for a while. I decided to open up the TP Link router and do this:
I had some heatsinks for a Raspberry Pi and they fit really well, except that one on what I expect is the RAM chip.
Its been connected for 13 days now with no issues. Hope it keeps going well.
Only 3 things changed
1) Changed ISP (unlikely to cause any improvement)
2) Added Heatsinks (I thought the chips could be overheating)
3) Updated FIrmware (Also a good possibilty it fixed my problem)
So not sure if 2 or 3 cured the problem really!
You would probably lose your warranty by opening it up so not really recommended.