I too had my TRS 'protected' without even knowing I had received 5 low DSRs (I rarely check them) until I received an email from ebay saying they could see the low DSRs were not consistent with the rest of my performance ratings and there fore I would keep my TRS.

I presume they were left by a buyer who purchased 5 items totalling nearly $100 and who argued the toss over postage when I point blank refused to send in a yellow pre paid express satchel (never offered) and said if she wanted them express she would have to pay for platinum express as I had based the postage cost on click & send as I WAS going to have PP seller protection.