iCloud Loopiness

iCloud isn't happy on my iPad Mini Retina lately.

About once every 2-3 days it just decides to switch itself off completely. The only way I seem able to get it back on properly is to disable Game Centre.

May be a coincidence, but this seems to correpont to Real Racing 3 suddenly telling me my iPad is having performance issues. 

I've seen some posts on blogs and the Apple support forum from other people with the same issue, but no real solutions. 

Anyone else getting this? If so, do you know how I might be able to stop it?