I have a Tivo Series 1 with lifetime service. It has been modified with a larger hard drive and wireless access. These mods were done 3 or 4 years ago. I am using a new glo remote with Bright House Scientific Atlanta Explorer 2100. The Tivo changes channels perfectly with the remote. No issues. BUT when it needs to change channels itself to record a show it frequently has problems. I have spent time watching it when the channel is supposed to change and it fails about 60% of the time for one of two reasons; either it doesn't even try, or it tries but gets ????? for the channel to change to so it does not change. I do not understand why this is happening and would appreciate any help. Thanks in advance.