File sender channel stops polling files from FTP server

Hi experts,

Scenario: File to File

The problem that one of the communication channels stops picking up files suddenly from the FTP server.But communication channels are in green state and functioning mode.

When I pinged the channel, it shows there are bunch of files that are readable, yet it does not pick them up.

When I restarted the channel, it picked all those files and processes successfully. Can't figure out a possible cause.

The PI version is 7.3 Dual stack, the adapter is the File Adapter, Protocol is FTP.

I checked in Java locks and these channels are not in lock state.

In channel we gave Data Connection as Passive and Timeout(secs): Empty

                             Connection type as Permanently.  So there no Timeout Problem.

Any clue on the root cause for this issue and also the way to avoid it from occurring again.

Thanks in Advance.

Regards,

NK