2010 Hyundai i30 Airconditioning intermittent

Hi - I've had my system recharged and tested after a leak. The aircon works fine when its a cool / warm day, but when its a hot day, it cycles very quickly. ie. compressor comes on for 2 or 3 seconds and then goes off for 2 or 3mins and back on for 2or3 seconds and continues to repeat. The cabin is not cold.

Any ideas what the issue could be?

thanks