How is it going. Did you solve the issue? You may have to isolate each device to see where it is.
After reading a little on the Bluetooth tech specs it looks like there are cases where it can use 5ghz. Not 100% sure but this is a snip from the 2500 page Bluetooth rules and specs
"If an implementation has knowledge of local regulatory constraints then such an implementation may be able to improve certain characteristics of the AMP link, for example by selecting a 5 GHz channel of operation to provide better performance with the collocated
BR/EDR radio.
3"
I looked back through my notes and found where the overlaps are in the channels and the only clean ones are 1 6 11. If you have a device broadcasting on 2.413 2.437 is the next one you should use, then 2.462
Here is a data table. If you are on 4 channels 1-8 will have some interference from the device on channel 4
1 -- 2 through 5
2 -- 1 through 6
3 -- 1 through 7
4 -- 1 through 8
5 -- 1 though 9
6 -- 2 through 10
7 -- 3 through 11
8 -- 2 through 12
9 -- 5 through 13
10 -- 6 through 13
11 -- 7 through 13
12 -- 8 through 14 (if you are not in the US)
13 -- 9 through 14
LTE and WiMax interfere with bluetooth. So cell phones in the area my hurt the connection.
I think another issue is a lot of people getting routesr for a 1800 sqft home but the router cover a 6000 sqft house. The router manufactures and tech sales people convince people they need the most expensive router. As a result we are polluting the airwaves
with too many signals