1) a client can reconnect when it was dropped due to a bad connection. In that case the number num_clients is indeed wrong. This will be fixed.

2) the dplay_timeout default value was too short in A7.70 and above. Set it to about 10 seconds. Otherwise you'll get false DISCONNECT events. The client was not disconnected, only the communication was interrupted.

3) packets can not be damaged. The reason of this problem was a too-small client data buffer, also in 7.70 and above, that triggers this message when it overflows. This is already fixed in 7.81. There is no fix on your side - I suggest to wait for the 7.81 release, and ignore the problem until then.