A temporary bidding restriction occurs when frequent buyers have too many cancelled orders within a short period of time.

This is a temporarily block on bidding that will be released automatically after 24 hours. 

The block is designed to ensure that items are being bid on by buyers intentionally with the desire to complete the purchase, because all bids on Tophatter are real and considered legitimate offers.

Note that buyers who repeatedly forego paying will become permanently blocked from bidding on items.