Hello, yes. I have the same problem. I have about 130 notes and it crashes after a few seconds.
I tried restarting the phone, I reinstalled the Notes app, neither worked. I did have success turning off iCloud sync and letting it delete the data synced to the phone. Notes will stay open but, obviously, it’s not useful to me without all of my notes. I turn sync back on, it begins populating the notes again, but at some point it will crash and the cycle starts over again.
There must be a character, attachment, handwriting, etc in at least one of the notes that is causing the app to crash. Notes still works fine on my iPad.
I worked with Apple Support a bit yesterday and after exhausting all options they suggested restoring the OS through iTunes. I wasn’t in a position to be able to do that at the time and hasn’t followed up yet. I doubt that is the problem, though.
It is not urgent I get this fixed but I do hope Apple identifies the problem and releases an update soon.