This is odd. I've been doing a lot of test running on a fairly long windy track on the living room floor (arc Pro). Some Fly cars have revealed their shortcomings but, in the main, all digitised cars (n = ~40) run well. The one curious exception is the current DPR Scalextric 911 Porsche (Black/white Le Mans livery, No 88). The pace and track holding are fine - it laps about 500ms better than my Group C slot.it cars. But, unless I really push the throttle, it sticks on the inside corner of my 90 deg 3rd radius curve. (Also outside corner of 90 deg 2nd radius curve). Larger and narrower radii are fine. And when it sticks, I mean it really sticks. Full revs and wheel spinning for 2 to 3 seconds to get it to release. Close inspection at eye level does not reveal where the problem is. I figured it must be bottoming out, but these things have the weight of a feather - that shouldn't jam up like that! I was so puzzled that I bought another 911 - exactly the same one, and swapped the chip. EXACTLY the same problem. In both cars, slot guide is free and easy, gears, axels, wheels all fine and motors amongst the smoothest I have! The integrity of the track looks fine. Has anyone else encountered this weirdness, or know what the solution might be?