Strange goings on (again)

For the second time in a month a particular person's name and phone number has come up randomly on the screen of my mobile phone, from my address book, not as a missed call. Normally it would take at least 10 negotiations of the phone display process to get to their name. And this time the phone keypad was locked. What's going on ...??? I have been staying out of contact with this person at the moment, and the last time this happened I contacted them, but got no reply.