Aircon not working after long distance driving

I realised that my 2006 civic 1.8L's aircon does not work properly after long distance driving of approximately 250+km. The aircon is blows very little air out and air's not cold. This is the 2nd time (1st time about 6 months ago)this has happen with the exact same symptons. Most recently, after this happen, my car was parked, unused for about 2 days. Then I drove a long distance of about 250km and again this happens. The technician advised me that the aircon clutch and relay has worn out, however I am a little unconvinced. If these items have been worn out, the aircon should have failed and completely not worked instead of only failing to function properly after long distance driving. A technician friend of mine highlights the possibility of icing which after reading a little more on icing, the symptons are alike. What is your opinion?