Incomming not working andomly

hello,
my server is operating normally, but I can not receive incoming calls (it randomly crashes, 3 or 4 times a day)
I have to restart my internet router mperatively to make it working again normal,
Thank you for your help,
sincerely

wiki.asterisk.org/wiki/display/ … +Backtrace

wiki.asterisk.org/wiki/display/ … nformation