Happens to me all the time, especially on the 'ring, every few seconds. It's like the engine cuts. The engine also goes completely silent and you just coast. Does not happen in qualifying, only in the races. Only happened since 1.06. My DS4 also turned completely off during one race and I quickly had to press the PS button, but I was still logged in with the controller when it came back on. Its very much spoiling the beta for me.