site to site problem

[SoNaRs]

hi there all

I got a little problem when iam use site to site like example 50 rar files then sometimes fxp doenst start with the next rar

EXample

i downloaded 15 files that takes me 5min /file
when file 15 is done the time keeps counting and doesnt start with file 16

Why can any1 help me