I agree with the others, you should get a reading.
Has somebody close to you recently passed on? Perhaps in the past two years? If so, it could be that person trying to get your attention. Spirits often tamper with electronic items to get our attention as they are easy to control.
As a funny antidote, my close friend can always tell when I am actively working with spirits, because one of my guides (a mischevious one who is very dedicated to his work, but likes to pull little pranks too), will turn the TV on and off randomly, or change the TV show we were watching to something funny like the Real Housewives of (insert drama-laden city here)
and turn the volume up really high. He thinks it is really funny! I swear you can almost feel his laughter in the room!! Haha! Now, my friend, once weirded out by such odd occurences, just rolls her eyes and says 'STOP'! Instantly, he will change channel back, lower the volume, ect.
I mention this as a side note, that although scary in the beginning, many spirits mean no harm and are just trying to get a message across.