Why does mysql keep crashing?

Question

linux

It was the second week. During this week, a site that no one visits crashed 3 times.
Specifically, there is no connection to the database. Restarting the service and working again. A few days.
And again there is no connection to the database.

Hoster believes that this is not his fault. He says different things every time. And no specifics.
Like - we updated something and restarted the server. And you don't have mysql set to autostart.
I take - manually I restart the server. mysql starts. Of course - I did not change anything - I installed everything from the repositories "out of the box." I'm not a fan of editing configs.
I don't even know what could drop mysql. Nobody knows about the site. It is not visited at all.
I think - that the hoster darkens.

Debian 8 system, mysql, php. VPS server. Wordpress + woocommerce site.
If not difficult, could you help with this issue.

vps logs
https://cloud.mail.ru/public/BJPF/YYXwZFheK

Answer 1

Wanguyu either falls from memory, or the max client (the first most common).
When it doesn’t work again, type dmesg there you will see what happened, I recommend either trimming the resources for the services (you need to edit the configs) or adding operatives

Answer 2

there was such a problem on VPS when swap was not connected.

Answer 3

Strange Mysql crashes and the logs are empty.
And what are the hoster's restrictions on the use of resources in time?