They both use the same antenna on the PI board so there is bound to be some conflict.
Using a separate WiFi dongle might help (but due to the close proximity it might make little difference).
Discoverer of the PI2 XENON DEATH FLASH!
Interests: C,Python,PIC,Electronics,Ham Radio (G0DZB),Aeromodelling,1960s British Computers.
"The primary requirement (as we've always seen in your examples) is that the code is readable. " Dougie Lawson