Others too, have received similar 'warning emails', and no further explanation to which item is involved, very frustrating.
All I can suggest if you have made several purchases recently, and not sure to which this refers to, is to contact eBay Customer Services, for them to explain further.
The easiest and quickest way to contact Customer Services is through this link, for a Call Back .
https://www.ebay.co.uk/help/eua?id=5275&mkevt=1&mkpid
On weekdays lines open between 8 a.m. and 10 p.m. - 6 p.m.
Weekends lines open between 9 a.m. to 6p.m.
If they cannot provide more information all you're left with, is to contact the manfacturer's of recent purchases, ask if their product you purchased has been recalled for safety reasons.
@tradeleaf-uk
