As a safe guard procedure if certain sensors are not tripped within 1 to 2 seconds during loading, or entering playback or fast forward it will automatically disengage and eject a tape.. or at least power down.
The cause can be from a stretched loader drive belt, or from a main drive belt.. or it can be the "position encoder" for the CAM that moves all the gears in the main drive has become corroded or dirty.
There are too many variables to tell without more information and careful observation.
I believe the JVC model your speaking about had a "special service remote" which could shoot specific Infared signals at the recorder to "Self Diagnose".. it maintained a buffer of the last few Error codes.. which when translated into English would indicate the specific part of the path, or the sensor responsible for safe guarding that "Step" as the one that caused the shutdown.
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