phone hates wifi

anytime i have my phone connected to ANY wifi it sticks/freezes up,  Wont process anything.  any App i am using just hangs there.  then sometimes the having issues screen pops up and askes me if i want to canecl or wait or I have to hold the power button in long enough it does a restart to get it to do anything.   but if i take my phone off wifi it works fine.  At home and work i have excellent connections.  So i know that is not the reason.  Any Suggestions? 

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