Old shit spins when there is no fuel left to control it. Contrary to what some believe fuel doesnt last forever and there is no way to refuel them. Solar can power the electronics but cant make them turn. Even older spy satellites (which they never talk about) are massively big. Then include the huge reflective solar panels. If nothing else all you need to do is look at the aircraft and rockets needed. I used to live in that area and every time you saw one of them flying in you knew it was picking one up. Some family worked in the buildings nearby and they would tell me how big their payloads were. Besides, if they are shutting things off because they want to keep UFOs secret, why not shut it off to keep our own shit secret? That and they would have to be some pretty stupid aliens knowing that they would be caught on candid camera if they didnt move away first. Its not as tho a space station is some farmer with an iphone.