Thanks for the quick response! There are no alarms coded in the script. Your second suggestion is something that I am not sure about. I will look into this. The third suggestion I believe I accounted for with a second nested infinite loop that tries to reconnect (using Net::FTP) until connection is reestablished. It then exits this loop with a last statement and returns to the overall infinite loop.

 
for(;;) {...

my $host = something;
my $ftp = Net::FTP->new($host, Timeout => 30);
  if (defined($ftp)) {
      my $TODAY = time;
      print LOG "Established ftp connection with $host\n";
      print LOG "at: ", scalar(localtime($TODAY)), "\n";
   } else {
      for (;;) {
       print LOG "Unable to make connection with $host\n";
       print LOG  "Try to reconnect in 5 secs to $host\n";
       sleep 5;
       my $ftp = Net::FTP->new($host, Timeout => 60);
       if (defined($ftp)) {
         my $TODAY = time;
         print LOG  "Established ftp with $host\n";
         print LOG  "at: ", scalar(localtime($TODAY)), "\n";
         last;
       }
   }
 }
...}
[download]

What is the last message that's printed to LOG?

That might help in finding the call that's causing the script to exit.