CDI 300 go off beat

If you are talking about the BPM counters. BPM counters are only a tool to help, they should never be counted on as the end all be all accurate measure. That should be your ears. Calculating BPM's in a CD players is a very complex algorythm. Unfortunately when it reads ahead your BPM reading may fluctuate, especially on complex drum patterns or bass lines that change often during a song.

I do use my ears, and actually it's easier than counting the BMP's. However, let's say for example if I have two songs,, and I have them on beat by ear, the BMP start to fluctuate and it trwos it off beat and I have to readjust the beats again.

In some cases, I have the same song on both cd players and the beats would vary from each other. I'm starting to wonder if my CDi might be malfunctioning?