3c.... Prior to the 3 low DSR's showing there was 1 low DSR. So much for DSR's being counted if from 2 or more buyers. The lone low DSR was showing from 1 buyer. It is therefore possible to accumulate a lethal number of low DSR's from one single buyer.

The way I understand it is that the star rating is not updated every time somebody leaves FB but in blocks of 10, which means that you cannot guess who left it, and as Coops said and as i said, only one low rating by one person within certain time will count for your TSR.  Not sure if the 6 one stars left by one person will chip your stars.

In any case, arguing about it here is not going to achieve much, looking how to improve your service is lot better option.  When my postage cost star started to look bit motheaten (despite the fact I only charge the actual postage), I listed number of small light items with free postage.

If your TOS and description is obviously not getting through to people, re-write it.  Make it as simple and short as you can; consider that some people use phones to buy, others may not have english as their first language