New bidders who buy frantically raise a few red (or at least pink) flags. You may find your buying restricted until you have completed some number of transactions and all has gone well as reflected in your feedback and the DSRs you have left. (A normal transacation gets Five Stars, btw.)
If you have been asking for cancellations or returning purchased items after opening Disputes, again the bots may have singled you out as a potentially problem customer.
Read all listings carefully. Ask for dimensions if you don't see them. Don't bid from a mobile device, the listings you see are incomplete. Shop on your phone, but put the item on your Watch List and bid from a"real" computer.
