I have a 2007 Mazda 3 Maxx Sport. The car loses all acceleration when driving

No hissing at all, no mods, all factory - stock. When the problem occurs, if I quickly press the throttle up & down the car will hop forward slowly. If I stop the car, open the bonnet and allow it to cool off for 30 mins it will accelerate again (evetually problem will come back). This Friday I will attempt to induce the problem while driving to the electrician and get him to put the data scanner on to check what is going on. To date the electrician has NOT been able to reproduce the fault.