AC not blowing cold, then it works fine !?!? What could cause this?

When the AC pressures are normal on this Altima , the AC works perfectly. So why does the AC stop working suddenly and the pressure max out ? #keepwrenching #wesselmotorworks #wrenchingwithkenny #airconditioner #airconditioning #freon #acsystem #acnotcooling #acnotworking #airconditioningservice #airconditioningservice