Cast them OUT

BOYCE and BOICE are two demons that interfere with any electronic equipment, i.e., phone, computer, printer, automibile.
If something malfunctions, BIND UP these two demons, and command them to leave your equipment, in the name of Jesus.

I don't really recommend going to demonbuster.com, which is the site containing the above quote, because it plays a hideous faux-organ piece which I guess is supposed to sound churchy. 'Demonbusters.com' is the home of the End-Time Deliverance Ministry', and I didn't read all of, but I get the gist and it's one loong, poorly formatted roll of strange bible excerpts and stuff which is surely made up, plus some links to homes for sale and to one of the Ministers - who is also a Mary Kay (think 'Avon') consultant.

They have something like 300 articles about demons and spiritual warfare. I picked one out, not at random:

DEPRESSION IS A DEMON

Handle this demon like any other demon. Cast him OUT, in the name of Jesus. Go to a THESAURUS and look up DEPRESSION. All the names listed are names of demons. Cast them OUT too. If this is new to you, go to our START THE BATTLE link at the top of our index on our main page.

If this is tempting you to take a peek, despite my warning about the music, I recommend the FAQ page. I'll finish with a quote from there:
9. Can demons mess with you while you sleep? - YES! Demons can, AND humans that know how to do it, can get into your dreams, or even have sex with you. See our INCUBUS article. Make sure you do Spiritual Warfare before you go to sleep.