Help needed: GoPro problems

I posted this in the moto section, as I know many of you have GoPro`s you use for moto and whatnot.

I have a Hero4 Silver which works fine, records everything, and I'm able to playback everything on the built in LCD screen.

However, I cannot get the camera and the app to connect anymore. The phone app pics up the cameras signals, but can't connect. It says: "Sorry, can't connect to your camera right now, restart and try again later".

There are no app updates available, so I have the newest one. Not really sure what's going on. Seems like the phone can't connect to the cameras SD all of a sudden. Never had a problem with the SD previously. I've been trying to fix it for a week now, and no new updates have been released in the meantime either.

Anyone had similar problems before? Any help is much appreciated.

Thanks