Fairly new, newly-charged compressor keeps cycling on and off

2005 Mazda 3, A/c compressor and condensor replaced less than two years ago. Last summer I noticed the A/C keeps cycling on and off repeatedly. I have had the unit charged, emptied, charged again, checked, and no one can tell me why it still turns on and off by itself. I am worried this compressor will lock too and I’ll have wasted all the money I spent. I’ve already spent a few hundred bucks trying to find the problem but no one can figure it out. An ideas? It’s nothing I can fix myself, I’m not a very handy lady when it comes to anything besides oil, tire pressure, or gassing up my ride. Thanks in advance!