So it was fine and now it's back?
One more idea: although it should throw a code, have them take apart the EGR and intake flap valve. It looks like a throttle. There have been a few cases where the gears that move the valve get stripped. Maybe by some chance the valve is closing, causing engine starvation. Aside from intake clogging, perhapes the EGR valve is somehow malfunctioning causing the engine mangement to get confused and cut fueling.
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