Hi all,
Yes, you are quite right.
The key is received every 10 sec (on average). It means that you have to zap channels at least once per 10 sec (6 channels per minute). This is not violation of the rule, it's normal.
To avoid frequent zapping, mix FTA channels with encrypted ones (4-5 FTA + 1 encrypted, etc.). I think, that is a solution.
regards