[O] Emacs hangs sometimes for no reason

[Sebastian Christ]

Hi list,

in the last couple weeks (perhaps months?) Emacs hangs for no specific
reason for me. The single constant is, that when it hangs, it hangs
while I'm in org-mode. This occurs on multiple circumstance as

- changing the outline structure by demoting and promoting headline
- when refiling
- re-schedule in agenda
- yanking
- perhaps more

The strange thing is that it happens unpredictably, e.g. I re-schedule
11 items without problems and the 12th one lets Emacs crash. Sometimes
it works for days without problems and then I promote a headline and
Emacs crashes. Very sad :(

When I kill Emacs with

  $ pkill -SIGUSR2 Emacs

this leaves me in the Emacs debugger in a flyspell function or (today)
in a avl-tree function.

My actual question is, had someone had similar issues? Or is it just me
with my configuration?

Perhaps someone can guide me on how I can find the root cause for this?
I pretty much lost here.

Thanks in advance for any hints.

Best,
Sebastian

-- 
Sebastian (Rudolfo) Christ
http://rudolfochrist.github.io
GPG Fingerprint: 306D 8FD3 DFB6 4E44 5061
                 CE71 6407 D6F8 2AC5 55DD