Массовые сообщения 75%

[aspirin]

Добрый день. Настроен zabbix(v5.0) сервер и подключены 7 zabbix proxy. последние 2-3 недели с 1 до 2 ночи прилетают сообщения о загрузке больше 75%:
Zabbix server
Load average is too high (per CPU load over 1.5 for 5m)
More than 75% used in the history index cache
Zabbix discoverer processes more than 75% busy
Zabbix trapper processes more than 75% busy
Zabbix poller processes more than 75% busy
Zabbix discoverer processes more than 75% busy
Zabbix unreachable poller processes more than 75% busy
Zabbix proxy 1
Zabbix data sender processes more than 75% busy
Zabbix heartbeat sender processes more than 75% busy
Zabbix proxy 2
Zabbix data sender processes more than 75% busy
Zabbix heartbeat sender processes more than 75% busy
Zabbix proxy 3
Zabbix data sender processes more than 75% busy
Zabbix heartbeat sender processes more than 75% busy
Zabbix proxy 4
Zabbix data sender processes more than 75% busy
Zabbix heartbeat sender processes more than 75% busy
Zabbix proxy 5
Zabbix data sender processes more than 75% busy
Zabbix heartbeat sender processes more than 75% busy
Zabbix proxy 6
Zabbix data sender processes more than 75% busy
Zabbix heartbeat sender processes more than 75% busy
Zabbix proxy 7
Zabbix data sender processes more than 75% busy
Zabbix heartbeat sender processes more than 75% busy

В течение дня такие сообщения не прилетают. В лога встречалась ошибка на cachesize, внес изменения в конфиге, ошибка ушла. Может кто то сталкивался с такой проблемой. Заранее спасибо