I’m not sure I understand the difference between a sun shade and a dark shade...but is there a small push button attached to some wires hanging down from one end of the shade roller? Or tucked up, hidden, at one end? There probably is and it’s purpose is to program the shade. Your problem doesn’t sound quite like an endpoint issue but it’s worth trying to reprogram it. I’d have to look up the instructions but I’ve done it and it’s pretty simple. Good luck.
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