wifi goes down all the time

2 weeks ago I moved into a 65 year old house that is in a valley.  My wifi is constantly disconnecting.  It get the internet cant be connected error rdx 03303.  I have to unplug everything and wait about 15 minutes for it to reconnect.  I have had a service guy come out and my signal is good coming into the house.  I even replaced my modem and router.  I have a 5 year old laptop attached to one wifi and my work laptop on a 5 wifi.  I didnt have these problems until I moved into this house.  At this point I am beyond ready to cancel my services and this is only one of the many reasons.  My boss is sending me a hotspot to help with my work connection.  However, it stinks I cant even be on my own computer to do anything.  What can I do?