If you have had a "couple of years" on the same hard drive then the problem of sync issues is most likely going to be the hard drive is starting to fail. 24 months is a long time for a hard disk that is in constant use.
As for the unresponsiveness of the remote this is something known as the "event switcher bug" and there is lots of threads on this subject if you do a search, or you can also look at this page: http://www.oztivo.net/twiki/bin/view...orLockedRemote
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