I have to hard boot my Iphone 5s to be able to read or send a message with Whats App

I

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I have to hard boot my Iphone 5s to be able to read or send a message with Whats App. my software is the latest. Can anybody tell me what the problem is?
 

phreddyl

Well-known member
Feb 12, 2011
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Hard to say- try deleting the app and reinstalling- see if that helps. I have been using it fine last few days.