Traccar 3.16 login error

Hello,
After upgrading from traccar 3.14 to 3.16 when trying to login I got the following error

and the same message from the log file,

2018-03-12 16:20:33  WARN: HikariPool-1 - Connection is not available, request timed out after 30012ms. - SQLTransientConnectionException (... < QueryBuilder:56 < *:132 < DataManager:329 < DeviceManager:217 < ...)

This is confusing because you just created a topic that Traccar doesn't start:

https://www.traccar.org/forums/topic/traccar-316-suddenly-stopped/

No you miss understand,

I have two issues,

1- after a day of upgrading the service is suddenly stopped, and I turn it on again and continue to work for a while.
2- the second issue is after while I can not log in to the service and got the above error, after restarting the service I can log in again but the problem keeps getting back.

OK, the issue in this thread is that connection to your database has timed out.

I did not have this issue before, now when i removed version 3.16 and installed 3.14 the service is running smoothly.

There were no changes in database connection code since 3.14, so if it happened after upgrade it's just a coincidence.

It is hard to believe that is just a coincidence, that only happen in version 16 and many times over, there must be a reason for this I should keep looking.

Thanks Anton for your great work.