With steerage from Mac2, Mark started switching the chip's communication function off for a while, then back on again, repeating it a couple of times. This was deliberate to bring the spooks running to check on him. As he watched them arrive, he switched back the communication enabling switch, so when he let the them in, the chip was receiving and broadcasting as normal.
"Have you been out and about?" one of the spooks half accused.
"No, not at all, been here all afternoon taking the rays on the balcony. Why do you ask?"
"Your chip appears to be malfunctioning."