When someone in my site opens the chat, it causes the system to crash
I have the premium version on a semi-dedicated host with specs:
2 CPU Cores
10GB SSD disk space
then I recommend to change your hosting provider!
Whatever is meant by 'semi-dedicated host' ... it's of no use if it doesn't even come with SSH access - because you'll need that not only for exactly examining things as asked by Arsalan but for database backups, too.
I do not have access to the console on the server, as i mentioned before the site is hosted,
The Cache is enabled
and the OSSN version is 5.5
The images you provided isn't enough. Before you mentioned that it only happens when you activates chat now it happens with every activity. So we are still not sure what exactly is wrong.
Try to run following command on your server
ps aux --sort=-%mem | head
Which should show correct processes using most memory.
However you have not provided other details like
Sorry for the delay,
the only information i have access to,is similar to hte above images,
It spikes every time some user performs any kind of action, whether is a post, a redirect.