@ rajelectroniks
You are bang on with your observation. I have noticed the exact same trend. There was 1 more thing I noticed with this date of 15th. My ebay monthly invoice gets generated on 15th of every month. As a trend my sales begin to fall from 15th to 19th. And as soon as I pay the bill around the 19th within 24 hours the sales begin to rise. I have a feeling either there could be some kind of financial limit on the accounts. Or if too many bills get generated on 15th then we have those many sellers using paisa pay to pay those bills, so maybe the payment gateway goes down.