So I tried my Terrascout again and it still has the delayed left-right movement. But I drove it around for a bit again and it not only delays on the left-right movement, but it delays on the forward-backward too. Its batteries and the remote batteries are full, and the gun and elevating/depressing the gun work just fine, but the movement is delayed.
Just to get it to respond to pressing the left-right stick all the way left took TWENTY-TWO SECONDS. Yes, I timed it.
Is there a fix for this? Or am I just going to have to facepalm that I spent $280 Canadian on a pile of pig vomit that breaks down from normal use?