We purchased a PS4 at Christmas and Skylanders Swap Force at the same time. Has not been used heavily and has never been moved, but the portal of power now connects only for a few seconds, flashes a few colors and then shuts off. Screen indicates portal of power is disconnected. The game cannot be played at all with this problem.
Have performed a web search as well and see that others are having some problem. One suggestion to plug another device (phone, tablet) to charge and this would correct the issue, but this does not work either.