Solve feedback from speakers, similar to mobile phone.
Only very recently i've been hearing a sound in my headphones and it sounds exactly like when i would recieve a text message or a phone call(with a much older pair of headphones). The difference being there is no phone anywhere near me and i've never experienced this with my current pair (wirelss Logitech F540's) and i've had them over a year, even when i'm using my phone right beside them. Its recently also being happening to my housemate who lives accross the hall from me, we've both tried turning our phones off and asked for our housemates living below us to do the same, but the problem persists.
Could there be some device that is causing the problem inside or outside of the house that i havn't thought of? And is there a method of fixing the headphones/speakers themselves.
I'd like to get to the bottom of it! :D