umm, material of the wall.. not sure, but not very thick and pretty new house so im guessing breeze block or brick.
as for devices near the connection.. There's mobiles ofcourse and there are 4 other laptops that connect to the same wireless network that all get the same problem.
If i hardwire the laptop to the modem it's fine never cuts off, but others can't use the internet then.. as for attaching it to the router via cable, i haven't actually tried that so i'll do that next and see what happens.