mgomez
Not sure about your car, but for my car (1992 300TE) the symptoms would fit to a compressor switch off due to speed differences: If compressor speed is lower by 30% or more than engine speed the clutch disengages and only resumes after an engine restart. Could be something as trivial as a loose and slipping serpentine belt. Or could be a compressor that starts to seize.
Regards, Bruno