None!
Yes mine has light bleed, but on auto brightness in 3 months I have literally NEVER seen it in real life usage unless actually turn the brightness up to 100% and look for it. In actual fact its got better from when I bought it in Feb. As for the lock ups you mentioned, since the last software update and using Chrome Beta I have seen no locks or reboots in at least a month!
I expect your problem is linked to an app not the device itself.
I've tried removing
most apps without success including chrome and location services. I guess running with no apps is the next step...
I havent done
much research on which apps area causing freezes but I did not find anything on what I have installed. Some notible non-google apps that I am running are:
AiCloud, Amazon store, BankOfAmerica,Calengoo, Discover, File Manager HD, GooManager, GroupMe, Hulu Plus, iHeartRadio, IP Cam Viewer, Md5Checker, MightyText, Mobile Queue, My Netflix Q, OfficeSuite, Speed Test, Swiftkey, UberSync, WD Remote, WeatherBug, Wifi Analyzer, Wordfued, XDA