Long wait before package execution

Hello

I have problems sometimes with a package.

There is and SQL Agent job that starts a package (from a file system using cmd command). Usually job takes 8-10 minutes. But sometimes it get stuck for a long time (1+ hour).
DTexec process can be found with procmon, but it seems it just not doing anything (And package is not logging to file Start of the execution) After long wait it just runs a package quickly.

I've moved a package to SSIS catalog to try to get more detailed logging, but with no luck.

Job starts at 1 PM, package execution starts at 1:49 PM. Without any messages about the execution in SSISDB log.

First I've thought it might be long validation problem, but when package executes validation messages are there and they perform quick.

Regards,

Olegas