daily crash of coturn at 10:38 ( segfault )

i have this in kern.log
Apr 20 10:38:15 ip-172-31-17-24 kernel: [ 9465.798339] show_signal_msg: 19 callbacks suppressed
Apr 20 10:38:15 ip-172-31-17-24 kernel: [ 9465.798342] turnserver[1045]: segfault at 7fcfc40008d0 ip 00007fcfc40008d0 sp 00007fcfd28848d8 error 15
Apr 20 10:38:15 ip-172-31-17-24 kernel: [ 9465.798345] Code: 00 00 00 f0 09 00 00 00 00 00 00 70 0b 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 55 02 00 00 00 00 00 00 <02> 05 07 07 07 06 03 07 07 06 07 01 00 07 04 06 02 00 00 03 00 07

this has been occurring since last coturn upgrade

it's almost a daily crash

it's running on a AWS virtual machine

I could not find any relevant job running at that time

 #47~18.04.1-Ubuntu SMP Tue Apr 13 15:58:14 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux

Distributor ID: Ubuntu
Description: Ubuntu 18.04.5 LTS
Release: 18.04
Codename: bionic