Alarm cleared on channel 1

hi, for some reason, i can’t make call, let say, yesterday was working ok, but after long hours(let say 12hrs), or when i up in the morning try to make call it wouldn’t go through, i restart the asterisk server pc, it still doesn’t work, but when i restart the vonage adapter, it work, the problem is Unable to create channel of type ‘DAHDI’ (cause 0 - Unknown), so when i restart it, it clear the channel, then it will work, why it just happen like that ?? thanks

[Mar 25 18:19:29] NOTICE[1067]: chan_dahdi.c:8012 handle_init_event: Alarm cleared on channel 1.

== Spawn extension (outgoing, 18777223755, 3) exited non-zero on ‘DAHDI/3-1’
– Hungup ‘DAHDI/3-1’
– Starting simple switch on ‘DAHDI/3-1’
– Executing [18777223755@outgoing:1] Monitor(“DAHDI/3-1”, “wav,/lamp/record/18777223755-1269566323.1,bm”) in new stack
– Executing [18777223755@outgoing:2] Dial(“DAHDI/3-1”, “DAHDI/1/18777223755”) in new stack
[Mar 25 18:18:48] WARNING[1330]: app_dial.c:1518 dial_exec_full: Unable to create channel of type ‘DAHDI’ (cause 0 - Unknown)
== Everyone is busy/congested at this time (1:0/0/1)
– Executing [18777223755@outgoing:3] Congestion(“DAHDI/3-1”, “”) in new stack
== Spawn extension (outgoing, 18777223755, 3) exited non-zero on ‘DAHDI/3-1’
– Hungup ‘DAHDI/3-1’
[Mar 25 18:19:29] NOTICE[1067]: chan_dahdi.c:8012 handle_init_event: Alarm cleared on channel 1
– Starting simple switch on ‘DAHDI/3-1’
– Executing [18777223755@outgoing:1] Monitor(“DAHDI/3-1”, “wav,/lamp/record/18777223755-1269566371.2,bm”) in new stack
– Executing [18777223755@outgoing:2] Dial(“DAHDI/3-1”, “DAHDI/1/18777223755”) in new stack
– Called 1/18777223755
– DAHDI/1-1 answered DAHDI/3-1
– Hungup ‘DAHDI/1-1’
== Spawn extension (outgoing, 18777223755, 2) exited non-zero on ‘DAHDI/3-1’
– Hungup ‘DAHDI/3-1’
– Starting simple switch on ‘DAHDI/3-1’
– Executing [1236400@outgoing:1] Monitor(“DAHDI/3-1”, “wav,/lamp/record/15591236400-1269568626.4,bm”) in new stack
– Executing [1236400@outgoing:2] Dial(“DAHDI/3-1”, “DAHDI/1/15591236400”) in new stack
– Called 1/15591236400
– DAHDI/1-1 answered DAHDI/3-1
– Hungup ‘DAHDI/1-1’
== Spawn extension (outgoing, 1236400, 2) exited non-zero on ‘DAHDI/3-1’
– Hungup ‘DAHDI/3-1’