[App_rpt-users] re-starting?

[Ken]

One of my boxes seems to periodically reboot or restart itself
I found this in the mmlog file

1417685329 - New session
WARNING: Freeing unused memory at 0xb21befd0, in iax_frame_free of
iax2-parser.c, line 1085
WARNING: Freeing unused memory at 0xb3385698, in iax_frame_free of
iax2-parser.c, line 1085
WARNING: Freeing unused memory at 0xa73bcd8, in iax_frame_free of
iax2-parser.c, line 1085
WARNING: Freeing unused memory at 0xb21d69a0, in iax_frame_free of
iax2-parser.c, line 1085
WARNING: Freeing unused memory at 0xb205ba90, in iax_frame_free of
iax2-parser.c, line 1085
WARNING: Freeing unused memory at 0xb21d87b0, in iax_frame_free of
iax2-parser.c, line 1085
WARNING: Freeing unused memory at 0xb205cb90, in iax_frame_free of
iax2-parser.c, line 1085
WARNING: Freeing unused memory at 0xb205c7e0, in iax_frame_free of
iax2-parser.c, line 1085
WARNING: Freeing unused memory at 0xa77d718, in iax_frame_free of
iax2-parser.c, line 1085
WARNING: Freeing unused memory at 0xb205c208, in iax_frame_free of
iax2-parser.c, line 1085
WARNING: Freeing unused memory at 0xb205c1b0, in iax_frame_free of
iax2-parser.c, line 1085
WARNING: Freeing unused memory at 0xb205e978, in iax_frame_free of
iax2-parser.c, line 1085
WARNING: Freeing unused memory at 0xb21da9a0, in iax_frame_free of
iax2-parser.c, line 1085
WARNING: Freeing unused memory at 0xb205ecf0, in iax_frame_free of
iax2-parser.c, line 1085
WARNING: Freeing unused memory at 0xb2060aa0, in iax_frame_free of
iax2-parser.c, line 1085
WARNING: Low fence violation at 0xb2060e18, in iax_frame_new of
iax2-parser.c, line -1
WARNING: Freeing unused memory at 0xb205dcd0, in iax_frame_free of
iax2-parser.c, line 1085
WARNING: Freeing unused memory at 0xb1e0c530, in iax_frame_free of
iax2-parser.c, line 1085
WARNING: Freeing unused memory at 0xb2060df8, in iax_frame_free of
iax2-parser.c, line 1085
WARNING: Freeing unused memory at 0xb205ea38, in iax_frame_free of
iax2-parser.c, line 1085
WARNING: Freeing unused memory at 0xa7802c0, in iax_frame_free of
iax2-parser.c, line 1085
WARNING: Freeing unused memory at 0xb205fe18, in iax_frame_free of
iax2-parser.c, line 1085
WARNING: Freeing unused memory at 0xb205fe18, in iax_frame_free of
iax2-parser.c, line 1085
WARNING: Freeing unused memory at 0xb21db3a8, in iax_frame_free of
iax2-parser.c, line 1085
1419887202 - New session
WARNING: Freeing unused memory at 0xb5df8060, in iax_frame_free of
iax2-parser.c, line 1085
WARNING: Freeing unused memory at 0xb5950d88, in iax_frame_free of
iax2-parser.c, line 1085
WARNING: Freeing unused memory at 0xb5952470, in iax_frame_free of
iax2-parser.c, line 1085

Where is says "new session" is where asterisk restarted itself.
What is going on? It looks like Asterisk is running out of memory but "top"
shows 818,180k of 2,058,004k used.  

Thanks
Ken