AutoDJcontrol script stops working

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Hi, till 3 days ago, the autodjcontrol.php provided here was working for our users withj no problems, but in this last days, when people tryo to use it it take a lot of time to log in and then it says "status failed" and then the users cant start or stop it, that hasppens on all accounts on the server and the weird thing is that nothing has been changed latelly.

Can someone help me to find a cause of this problem and get it fixed?

Thank you in advanced
Alexandra