My iPad mini suddenly keeps crashing this happened after I updated the IOS to 7. Why is this ?

Assuming "Why is this happening" isn't really what you want:

Try a reset. Simultaneously hold down the Home and On buttons until the device shuts down. Ignore the off slider if it appears. Once shut down is complete, if it doesn't restart on it own, turn the device back on using the On button. In some cases it also helps to double click the Home button and close all apps BEFORE doing the reset.

In the majority of cases, those apps are not really doing anything if you do not have them actually opened on the screen (music apps are an exception, for example), and you shouldn't have to worry about them. But it is a good first troubleshooting step.

The next iOS update, iOS 7.1, is believed to contain some fixes which correct crashes in iOS 7.

According to some of the computer press this release should be available shortly. Perhaps this may help with your problems.

what you are "dealing with" is a line of code in safari that keeps the ipad from crashing in the ios 7 update they removed that line of code which made the ipad extremely unstable you can know when its about to crash when it starts to slow down

but there are a lot of bugs that were in the actual operating system 54 to be exact!

thers glitches incude

.the screen zooming in when tapping with 3 fingers even if the accessability feature is disabled

.the control menu glitching up

.the screen softlocking

.images not being displayed properly

.tabs being deleted in safari

so in a way ios 7 is actually one of the most glitchiest and unstable operating systems on this planet and the same can be said about ios 8

This thread is more than a year old !