I don't believe I have experienced any such bug with 4.3 - I believe the bugs you mention are on the side of devs not updating their apps for 4.3.
Instead of randomly flashing a ROM without knowing where the problem lies, consider trying to narrow down when exactly this problem occurs.
Can you reliably reproduce it?
It may be hardware related, being on stock at least rules out your problem is caused by bugs in a custom ROM.
Are you rooted? Did you overclock/undervolt with a custom kernel? Are you running any apps to modify the lockscreen?
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