Why is Subway Surfers being buggy?

I have an iPhone 4S and am addicted to Subway Surfers. A week ago, the game was running smoothly, now it's choppy and bugging. I'm missing power ups and coins. Is there something I need to do to fix it? I can't delete the app because I don't want to lose my data.

This is problem with many these days. Here is the fix

Check your internet whether it is on or off… Because these days internet connectionis making smartphones hamg for second or result in slow speed…

2). You must have not updated it. We're currently in Paris so update it… Or if you are already updted try again.

if you have any regular problem then please describe that and see what changes you have done in these few days…

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