Last couple of weeks I have been having this problem: basically every time I turn my PS4 on, I have messages in my notifications telling me my saves could not be uploaded. When I click on the failed upload, it says the data was uploaded from another PS4 and asks me if I want to overwrite it. That's false, I have never even signed in from another PS4. I started to notice this with Child of Light and now both Wolfenstein and Transistor are doing the same thing, so it must be a system problem.

I have bought all these games digitally on another account, but both accounts have this single PS4 set as the primary one.

Anyone with a similar issues or perhaps a suggestion how to solve it?

I've got the same problem. No solution though. ;(

Yeah, I've been having this issue too, as have some other people I've spoken with. Hopefully Sony will patch in a solution at some point.

Ok, thank you - looks like it's up to Sony then

@quipido: Its a known issue even the PlayStation support account @AskPlayststion has been directing people at this thread. (Sorry can't link on mobile)

http://community.us.playstation.com/t5/PlayStation-4-Support/Game-Save-Data-cannot-upload-error/td-p/42464669/page/7

Same, good to know it's not just my PS4.

It only happens with Child of Light for me and its super annoying

I had the same problem. My solution was to turn those fucking notifications off.