using 23518 w/ 16PP here. i get some random freezes too. Usually when opening a link in my email (not often but happens once in a while) and I def get lock ups for a good 30 secs when browsing my storage card with file explorer 60%-70% of the time.
I was chalking it up to bugs in 23518 though. I want a new 6.5.5 (i think 23518 is 6.5.5)!
love the threaded email and can't lose it now.