I had a similar problem and was given the following information :
Try to update the app as this may be causing the issue.
Once the app is updated the next step is to clear out the cache.
If the above doesn't solve the problem then you maybe need to look at what Background Processes you have running.
If you've installed a lot of apps that run in the background these may slow down your device.
If you don't use an app that's running in the background, uninstall it. If you can't uninstall it because it came with your device, disable it.
Hope this may help and you get your problem sorted very soon.