Logstash Stucks in org.logstash.beats.ConnectionHandler

My Logstash instances are stuck in "org.logstash.beats.ConnectionHandler" consuming a lot of CPU and not processing any input anymore. Trace bellow:

[2019-06-12T00:37:20,751][TRACE][org.logstash.beats.ConnectionHandler] dc553046: sending keep alive ack to libbeat
[2019-06-12T00:37:20,751][TRACE][org.logstash.beats.ConnectionHandler] dc553046: acking was successful
[2019-06-12T00:37:20,751][TRACE][org.logstash.beats.ConnectionHandler] 5b3eead6: sending keep alive ack to libbeat
[2019-06-12T00:37:20,751][TRACE][org.logstash.beats.ConnectionHandler] 5b3eead6: acking was successful
[2019-06-12T00:37:20,910][TRACE][org.logstash.beats.ConnectionHandler] e64035a8: sending keep alive ack to libbeat
[2019-06-12T00:37:20,910][TRACE][org.logstash.beats.ConnectionHandler] e64035a8: acking was successful
[2019-06-12T00:37:20,937][TRACE][org.logstash.beats.ConnectionHandler] f6c99e9d: sending keep alive ack to libbeat
[2019-06-12T00:37:20,937][TRACE][org.logstash.beats.ConnectionHandler] f6c99e9d: acking was successful
[2019-06-12T00:37:21,022][DEBUG][org.logstash.beats.ConnectionHandler] dfff5012: reader and writer are idle, closing remote connection