Hasn't happened to me in a while, but I used to stay a lot at a fairly upsacle hotel (Capital Plaza, or something like that; comparable with a good Hyatt) in Bao An near Shenzhen, and this happened there all the time - usually several times per night, every night.
After the 1st night of my 1st stay I just started unplugging the cord from phone when I went to bed, and plugged it back in when I got up. Of course that means no wakeup call
Hasn't happened to me at a US chain, and I would be furious if it did.