That only happens when a range of telescopes point at a certain spot in the sky? It's possible, but by now they've likely ruled out most possible malfunctions.
Could it not be signals from our own equipment/satellites/spy planes/etc?
These radio telescopes have a fairly narrow focus and when two telescopes located on different continents aim at a source several billion light years away, their focal points do not overlap anywhere near earth, so that rules out anything on or near earth. You could come up with a theory where it does originate on earth, but it wouldn't pass Occam's razor.