wireless connection keeps dropping

I am using a Macbook Pro 10.9.5 and a BT Home Hub router. Since buying my Mac six months ago it has worked flawlessly on the internet until I recently returned from holiday - Mac had been disconnected during that time - since when I have had very intermittent internet access and great difficulty in getting back on whenever it drops off. I have tried to set up the network again many times, have tried to enter the IP address manually and nothing seems to work reliably. When I do get back on to the internet, I have tried so many things that I don't know what actually made it work so can't repeat it! All my other devices work fine so it's not the router that's at fault but I am at my wits end to know what else to try. I am a simple user and not a techie so if you reply please don't be too technical! Other things I have tried include deleting the router from my keychain and starting again (this worked once but doesnt now), setting it up again in a different location (now have masses of locations and don't seem to be able to delete them). I am now logged on to an unsecured BT network which seems to work (slowly) so don't know why my own doesnt. Error messages I have received include: no IP address, wrong password (it definitely wasnt wrong), wrong location....I do hope someone can help me please. Thank you.