2003 Jaguar XJ8 motor problems

Dear friends

During driving the engine suddenly almost stops.
all lamps on the dash start burning.
the display says:
Park brake fault
DSC not available

After pulling over I take the key out of the ignition, wait for 5 seconds and start again.
The engine runs normal.
After about 15 to 45 minutes it happens again.
After a few time the engine fault lamp burns but engine runs normal until the problem happens again.