RUN FOR YOU LIFE!!! (kidding, but not really)......... they are tricky bastards....
It could be because of a recent CO visit. It could also be because the memorial is around the corner. It could be someone saw you doing something (smoking or something) and snitched you off. It could be they're going through their publsher cards for sheparding calls. It could be they are going through publisher cards to clean house.
I found this thread on JWN re your situation, check it out lots of good advice:
http://www.jehovahs-witness.net/jw/experiences/201041/1/ELDERS-want-to-meet-with-me
Note: I found this post below especially true and informative. It was on the same thread I suggested you read above:
By Donuthole:
"It may be that they sincerely want to visit with you and see how you are doing; however, don't discount the idea that they might be stopping by to see how you feel about "Jehovah's Organization" with the idea of getting you back to the meetings or disfellowshipping you. You asked, "Should I be worried?" I assume that meant you still want to remain a Witness, officially, while still being inactive.
If it was simply one elder dropping by I wouldn't worry too much. If there are two elders than they might be making an investigation visit. If you don't want to be disfellowshipped you need to be very, very guarded with what you say to them. You would want to avoid expressing any doubts over their practices or teachings. You specifically need to avoid the question, "Do you believe this is Jehovah's Organization?". You also need to be careful if they try to put you in a corner by asking, "Do you still feel you are one of Jehovah's Witnesses?" What they may be doing is trying to lead you into a line of conversation where you will disassociate yourself by word.
I don't know your reason for being out for five years but the the explanation that they will accept the best would be discouragement over how people treated you. Alternatively you could talk about depression or getting distracted with work and life or something like that.
It might be best to put off the meeting and see how persistant they are to meet with you. Unless they are on witch hunt, Elders can be pretty unzealous about their theocratic routines. In the new elder's book they are specificly counseled against spending too much time with "chronic cases". If you put off their visit they might lose interest."