Could you please explain what  this mean in FreeSwitch log??? 

----------------------------------------------------------------------
[...]
2013-08-07 23:40:48.011687 [CRIT] switch_core_session.c:1705 Thread Failure!
2013-08-07 23:40:48.011687 [CRIT] switch_core_session.c:1665 LUKE: I'm hit, but not bad.
2013-08-07 23:40:48.011687 [CRIT] switch_core_session.c:1666 LUKE'S VOICE: Artoo, see what you can do with it. Hang on back there....
Green laserfire moves past the beeping little robot as his head turns.  After a few beeps and a twist of his mechanical arm,
Artoo reduces the max sessions to 101 thus, saving the switch from certain doom.
2013-08-07 23:40:48.031685 [CRIT] switch_core_session.c:1705 Thread Failure!
2013-08-07 23:40:48.031685 [CRIT] switch_core_session.c:1665 LUKE: I'm hit, but not bad.
2013-08-07 23:40:48.031685 [CRIT] switch_core_session.c:1666 LUKE'S VOICE: Artoo, see what you can do with it. Hang on back there....
Green laserfire moves past the beeping little robot as his head turns.  After a few beeps and a twist of his mechanical arm,
Artoo reduces the max sessions to 101 thus, saving the switch from certain doom.
2013-08-07 23:40:48.041688 [CRIT] switch_core_session.c:1705 Thread Failure!
[...]
2013-08-07 23:55:38.141571 [CRIT] switch_core_session.c:1705 Thread Failure!
2013-08-07 23:55:38.151578 [CRIT] switch_core_session.c:1705 Thread Failure!
2013-08-07 23:55:38.171584 [CRIT] switch_core_session.c:1705 Thread Failure!
[..]
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It is not funny, at that moment freeswitch consumes 98% of CPU time, and did not response at all.


PS: (Version 1.5.5b git 8d005a4 2013-07-22 14:41:01Z) @FreeBSD 8.2-RELEASE (x64)

--
Nikolay