Jag XK8 Conv 1999, "Severe Restricted Performance" red &yellow light;

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Intermittent "Restricted Performance" Yellow light. Recently a ""Severe Restricted Performance(?)" Red and Yellow. Car almost stopped, and could only move at less than 10 mph. I stopped car, turned off ignition and waited a few minuets. . I was able to restart engine, no "Restriction" lights; and drove back home. I have started up car and moved it around in driveway, but not driven for fear of getting stuck. How long have you had this problem? A few weeks "Restricted Performance" intermittent ; first time for"Severe Limited Performance