Asterisk crashes after leaving voicmail and others

Hi there everybody,

I have asterisk running on 3 servers. The latest one has 1.4 version others are old. One is just using for calling card platform. the other one including new one will be served for pbx system. The older one did not have any issue on this heading but the new one has it.
I can create voicemail, i can see message indicator and read it accept
after leaving message when # key pressed or just hung up asterisk crashes with the last comment " segmentation fault (core dumped)"
I have to restart asterisk -vvvvvvvgc with this command and listen the message. Can anyone give a solution of this?

Other problem is when someone dial an extension after greeting and if you alredy know the xtention plz dial it now after the prompt i dial 200 the extention and after a long time the target extention rings where it suppose to ring instantly when i dial the ext and it was working fine before . How can i get to fix it to instant ringing?

One more thing i cannot dial while greetings and other prompt playing
what is the way to dial the exten while in the middle or beginning of the
prompt so that i dont need to wait untill it finish and take my dialed exten
it must be similar to barge in but could not find it can any one give solution of these 3 problems??