I restarted my Galaxy S6 and now it is frozen.


    My phone was running a little slow today, so I restarted it.  Now I have a teal blue warning screen that says:  "Warning -  A custom OS can cause critical problems in phone and installed applications."  It says Volume Up to Continue and Volume Down to cancel and restart phone.  Nothing works.  It is frozen on this screen.  Can't turn it off or anything.  Please help!!!  Any suggestions?  Phone is barely a year old.  Never any problems so far....   I have NOT downloaded ANY custom OS....  only the usual apps like FB, Instagram, etc.

    Thanks, Becky

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