winbox and ssh connection problem with simple queues

Hi,

We have been experiencing a strange problem during the simple queue set up.

While typing the IP address of the client that should have its speed controled, Mikrotik cuts the connection (from winbox and also from ssh).

The only way to regain control was to disable queues (which I had to do localy with MAC address).

To work around I created some queues in the disabled state and just change the address when needed. But during this configuration my connection was broken twice. So I am afraid to lose control of the box once more.

Any ideas? (Is command line somehow safer…?)

Thanks, Enio