Try Changing the batteries on your remote. Sometimes the hardest problems have the easiest solutions. And its usually that. I have also seen that depending on the kind of remote you are using sometimes the remote itself won't be able to change the channels. I am pretty sure it has to do with your remote. Please let me know how this turns out.
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I had to replace my remote. I bought a new one online and it worked well.
Try Changing the batteries on your remote. Sometimes the hardest problems have the easiest solutions. And its usually that. I have also seen that depending on the kind of remote you are using sometimes the remote itself won't be able to change the channels. I am pretty sure it has to do with your remote. Please let me know how this turns out.