Data load issue in BW

Hi Experts,

We have a load (DSO --> DSO) which is taking 3 hours daily. But for past 2 days it is taking 5hr.we checked if any changes moved to production in last one week and found nothing also we check the volume of data, it is increased just 50 records.The total load was handled in 3 data packets and check the Background job availability... and found all three packets got background jobs but still unable to find out the reason why it was increased in data load time.

Can any one kindly provide you valuable inputs to find the issue.

Thanks in advance.

Regards,

Senthil K.