High consumption of CPU after upgraded to 11.6.0

Hum.. I can see anything about Policy learning... If I active a policy learning i see the cpu jumps to 100% and the top proccess is learn_manage so I turned off the learning and everything sounds good... BUT I DON'T want to leave this off... something wrong here!! SURE!

When our pair did a fail over and looking for logs I discovery that failover was because the disc latency... anything about 10seg to response.... and saw in someplace about this version was changed anything about how write logs... so.... I m sure about this change on the logs has something with policy learning... maybe a exccees of disc IO... i dont know