Curious with my V70 II

Hello to each other, have a strange experience with my V70. About 3 weeks ago for me in the morning calmly started to a professional appointment. I came just 5 kilometers away when I noticed that my car no longer took any gas. So for me to the right ran, and the engine turned back and forth between 1500 and 3000 tours. In the display then came the error: engine system, maintenance urgently. Car to the free workshop, they read the fault memory, were on the phone with Volvo WErkstatt and then it was: New air mass meter and/or throttle valve housing. But first they wanted to make a test drive. Then no more error came out. With me also not the last 800 km, so I thought, the topic was done.. electronic had probably spun. BIS HEUTE. Ride this morning from home, even way as the error occurred for the first time. and swoops.. after my V70 now 3 weeks without a problem.. again the same problem … and I had rattless and frustrated.. Does anyone know what to say hello to Andreas with the car?