This might sound odd Looney but have you moved anything around in your home lately, maybe repositioned furniture, appliances or similar? Also thinking about moving stuff, do you have any options regarding the location of the router itself? If you can move that across the room, out of a corner, up onto a shelf or even into a different place in the house that might help.
Also have you considered buying some bigger antenna for your current one? We have our router in a room at the back of the house and had a PC on the opposite side that was periodically dropping signal, got some cheap booster antenna for the router and moved both the router and problem PC around just a bit in their respective rooms and it helped a ton.
Oh also, and I mean this is the most light-hearted, friendliest way possible..
.. sorry
.