Cron Locked Forever?

[Leinad4Mind]

After the 3.2.5 upate I've been having always an Cron Locked.
Right now it says: "Cron time locked: less then 1 min ago, Cron: pnaoa7lm1z8bvipb"

That code that should say the name of the task, changes each hour I guess. How can I debug this to know why this is happening?

[ForumHulp]

What's in your serverlog?

[Leinad4Mind]

My serverlog was full of "ModSecurity: Warning. Operator LT matched 20 at TX:inbound_anomaly_score."
About cron I had those:
[Tue Jan 15 15:49:40 2019] [error] [client] [host] AH10141: FastCGI: comm with server "/forum/cron.php" aborted: idle timeout (300 sec), referer: /forum/viewtopic.php?f=80&t=1394
[Tue Jan 15 15:49:40 2019] [error] [client] [host] AH10149: FastCGI: incomplete headers (0 bytes) received from server "/forum/cron.php", referer: /forum/viewtopic.php?f=80&t=1394