Hang NiFi threads on 1.13.2.RC1

Hello.

I'm using 1.13.2.RC1 and recently i started to notice something, it suddenly stops to process all the flows and hangs the active threads by not giving any response anymore.

There's no error in the log, as the time passes, it's only showing a bunch of Minimal Locking Write Ahead Log, and nothing more than this.

As long i do not restart, it keeps as it is infinitely, until i restart and everything starts to work once again.

Can somebody please give me a light to what's happening?

In this print, there's a process group and in there, a bunch of Query Database Table and some other processors, and it's hang.

Example of hang Query Database Table:

Once i restart, the infinite active thread quits.

Important info:

Maximum timer driven thread count: 20

Maximum event driven thread count: 5

Connection Pool 1.13.2: Max Connection Pool: 15.

The database itself is working properly and fine.

Thank you in advance.