Apps that will not run

Recently this has become quite a problem for me on my iPad 3,I have a few apps that will suddenly no longer run. If I uninstall and reinstall then that generally solves the issue, though it the past it has not.

Yesterday for some reason my iPad would not connect to my carriers 3G network, switching airplane mode on/off did not solve so did a reboot. Straight after this apps such as tweetbot will no longer run. I have about 4 in total.

Just wondering if anyone had any tips? One of the apps is a magazine so having to download 500mb each time is a right pain.