Splunk DB Connect 2: Why am I getting error "Cannot get a connection, pool error Timeout waiting for idle object"?

Hello Splunkers. I have 2 connections with a Microsoft DB using Splunk DB Connect 2. For some time, everything was OK, but all of sudden Splunk stopped indexing new data. Looking at _internal, I saw these following errors: 01/04/2016 17:19:44 [ERROR] [websocket.py] ERROR: java.sql.SQLException: java.sql.SQLException:java.sql.SQLException: Cannot get a connection, pool error Timeout waiting for idle object. 01/04/2016 17:19:44 [ERROR] [ws.py] [DBInput Service] Exception encountered from server on_message for entity-name = mi_input://Input_PT and type = input with error = ERROR: java.sql.SQLException: java.sql.SQLException:java.sql.SQLException: Cannot get a connection, pool error Timeout waiting for idle object. I've read that maybe DB Connect 1 could solve this issue. Have anyone seen this before? Thanks in advance