The only other thing I can think of is 2.4 Ghz wireless phones. I just changed my house to 5 gig phones because of interference I was getting onto the wifi wireless LAN. Some 2,4 gig phones with remote handsets even send information around when there is no phone call in progress.

My situation (wireless networking) improved dramatically when I changed to the 5 gig phone units. I chose the ATT system with a single base station and up to 5 remote handsets that have no telephone connections. Speakerphone in all units, reasonable price, Battery backup in base station for power failures, CallerID and call logging along with speed dial. Nice system but off the subject.