rlm_sql Error

Hi, Here in the ISP which I work we have a Freeradius 1.X in production, and a 2.X that we're testing to replace the old one. On both Radius we get the following error sometimes, What can be causing this? The SQL Database is in the same server of freeradius 1.X, but the load is low, we have about 2500 subscribers. I was thinking about increasing the number of sql connections, which is set to 4, would it make any difference? Database server load: load averages: 1.10, 1.05, 1.03 Error: rlm_sql (sql): There are no DB handles to use! skipped 0, tried to connect 0 Thanks in advance.