packages with damaged ECM structures sent to the server. (limit is 10 requests per 10 minutes, ban for violation - 10 minutes)
Packages with damaged ECM structure - are fragments of full ECM package (CW) received by the server being damaged on teh way to server, or they are initially damaged by the receiver. These fragments being caught by smart cards can damage the cards. This is the reason why server blocks the accounts sending them.
In 90% of cases, the reason is bad internet connection. The package is being destroyed on the way of its transmission (route), or being sent by receiver with the uplink being overloaded (outgoing traffic). Typically, the traffic is "eaten" by P2P clients (torrents, etc.). To resolve this problem, you need to disconnect all software which uses outgoing traffic, check thr route to the server for losses using traceroute command, try other internet provider. If this is helpless, flash your receiver again using newer or older firmware with ECM package being built correctly (update emulator with newer one).