I *think* there were a few faulty rtr rx/tx sets kicking around. Don't quote me on that!
And FWIW, I bought an rtr roller (the electrics except servo had been cannibalised) and the stock servo was dire, especially when matched up with the servo saver. On our tracks (either astro or high grip carpet) I couldn't even get the car to turn properly. Removing the servo saver didn't help much. So I just put a 20 quid mks 1210 servo and an aluminium servo arm in, ran that for a few months with no issue.
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