Hi Rohit,
thx again for your valuable input.
From the bad requests' respectiv start times I assume they were created by a job thoug I didn't find one in the system for that times. So I assume it must be initiated by solution manager or something, Got to clear that out still.
Anyway, as you suggested, I set the runnin and waiting requests in SMOFRSTAT to DONE and started my download again - worked like a charm.
regards, anton