Piwik is outage when we encounter MySQL connection problem

@alex.kan wrote:

Hi, Sir,

After search on Google and this forum, we still cannot have any idea;
therefore, we ask for help here.

Our Piwik version is 2.16.1 and the peak visits is 213,292 per day.
We found that when we encounter the following problems, our Piwik server cannot reply to clients' requests any more.
What we can do is to kill MySQL process and then restart MySQL service because service restart doesn't work at that time.
After restart MySQL service, Piwik comes back to normal again.
Do you have any suggestion?

[problem 1] Error in Piwik (tracker): Error query: SQLSTATE[HY000]: General error: 2013 Lost connection to MySQL server during query In query: SELECT visit_last_action_time, visit_first_action_time, idvisitor, idvisit, user_id, visit_exit_idaction_u...
[problem 2] Error in Piwik (tracker): SQLSTATE[HY000] [2003] Can't connect to MySQL server on '127.0.0.1' (111)

Thanks,
Alex Kan

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