Eventually at one time or another, you will eventually receive that dreaded MC999 suspension. The type of restriction will largely depend on what rule you broke in eBay’s eyes. The most common one we see are the MC999 suspensions which are unavoidable at times. A host of reasons you can be suspended, but down below are some typical ones.

They can happen if you:

Avoid paying seller fees
Bad DSR ratings
To many disputes
To many complaints
Scamming buyers
Slow shipping or communication times
Competitors
Suspicious Activity
Risky tactics (I have no clue what that means, but that is what eBay says.)

These are some typical ones and then there are others that are shots in the dark. Suspicious activity can mean many things which eBay never really mentions.