BungeeCord strange laggs

Hi. Since few days my server's got lagged for few seconds every 1 minute. I've got 250 players on average.

1st dedicated server 32gb of ram:
-Survival=26gb
-Lobby=1,5gb
-Bungee=1gb


2st dedicated server 32gb of ram:
-PvP=27gb


When one server's got lagged,the second one's lagging too. Can u help me? My BungeeCord's plugins are:SlashServer and ServerInfo.