What does the "very reputable" AC shop say then? If it's fully charged and they've taken your money, they should then be able to properly diagnose your AC concern, right? If the freon charge is correct, the evap (even if slowly leaking) isn't the cause of why you're now still having problems so don't let them replace your evap now because of this.
If it's fully charged (and there's no doubt) then I'd check pressure switches (2) and if it's doing this with a hot engine and the temp guage reads higher than normal, a sticking thermostat (sticking closed) will cause the fuel ECU to shut the AC off (not common however).
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