Rock candy is not a good choice for connection. Try to check for any problems with connection (ex. Bad battery, another connection is blocking the new one) and buy a regular remote.
Try looking at the connection, It may be turned off. If the problem continues try connecting to a different location, and take it to a professional to check it out.
Get a bowl of dry boiled rice and put your phone in for an hour or so (make sure there is no water in the rice) the rice will soak up the water and your phone will work properly again.