Freezing again

This issue can't be just me... he phone will freeze while trying to use it(nothing is responsive), won't wake up even if charging the light stays on. It has even froze during a phone call, and I didn't realize until I tried to navigate to an app and the power button wouldn't turn it ok but I still had a phone call going. I have noticed the last two times it's happens, regardless of build or ring, that if I change the top speed from 4g to 3G the issue goes away. Any reasons why this would be? It was a total ******* this morning and since I did that change it has stopped.

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