This happened constantly to me as well, but not the last couple of days, but now it seems to crash when I "sleep" it by holding my phone upside down. Sometimes

This happened constantly to me as well, but not the last couple of days, but now it seems to crash when I "sleep" it by holding my phone upside down. Sometimes it doesn't wake up again and sometimes touch doesn't work after I wake it up. But it's not a huge inconvenience.