receiver did not get the keys from the server. ...But most of the time I get the keys.
Paradox - receiver did not get the keys and, on the other hand, most of time you get the keys. How shall we understand that? It is impossible not to get the keys and get the keys at the same time. Either, you get the keys OR not.
Consult support forums of your receiver and you will get the answer to all your questions.
One thing I want to say - there is no problem on the server. Everything depends on
your receiver firmware, config files, emulator settings, internet (ping and route to the server).
Coming back to your first post, I will ask again - did you take a free test before buying full subscription? I think - no. Everybody thinks that he will be able to watch TV without changing settings of his receiver. No. CS settings need fine adjustment and some knowledge.