For a number of times now, over several weeks, whenever my N9 goes to sleep, I can never get it to turn back ON by way of double tapping the screen or pressing the ON button. The only way for me to get it back ON is to shut it down and ON again. Is anyone else here having the same issue?

I'm still trying to figure out when it does this but I'm guessing this happens when I receive a call, then the conversation ends without me hitting 'end' and the phone goes to sleep......

I to have a problem!

I too had this couple times and had to use the lock button instead to wake it up and not as serious that I had to restart so didn't bother at all..

hi, (sory for my english, using google translate).

another solution is to connect the phone to the wall to charge. magically wakes!!!!

yes sometimes the double tap fails but I never needed to restart my phone

Reset your phone settings in the control panel. I had this once on the N950 and resetting the settings helped. I believe it may be connected to installing the Wake application.