When exiting highway 35-45 MPH right turn only,the interior lights come on and then go off when I resume driving straight

code p0320 refers to cam shaft position (CKP) sensor/engine speed (RPM) sensor--circuit malfunction=== causes --wiring--CKP/RPM sensor ---ECM
because the engine runs ok until it is on cruise control I would be investigating the RPM sensor for a fault
The cruise control takes its control from the RPM sensor and if that circuit is interminable the the cruise control doesn't know what rpms to maintain.

change the spark plugs

check the drive line "U" joints

Volkswagen had a series of bad ignition switches that should be covered by a recall. Did you check if your car is effected by the recall? The result of the bad switch is very much as you described. Car just stalls on the highway.

one of the door ajar switches are sticking. needs to be put on the computer to find out which one. only other way is to go around and unplug the switches until your light shuts off.

The tire pressure
monitor system can be reset two ways. With the ignition position at ON, pull the interior lamps control to the ON and OFF settings three times. It can also be reset through the radio using the
following steps:
1. Turn the ignition to ACC or ON and turn the radio off.
2. Press and hold the TUNE DlSP button on the radio for at least five seconds until SETTINGS is displayed.
3. Press the SEEK SCAN up or down arrow to scroll through the main menu.
4. Scroll until TIRE MON appears on the display.
5. Press the 1 PREV or 2 NEXT button to enter the submenu. RESET will be displayed.
6. Press the TUNE DlSP button to reset. A chime will be heard to verify the new setting and DONE will be displayed for one second.
7. Once the monitor has been reset, scroll until EXIT appears on the display.
8. Press the TUNE DlSP button to exit programming. A chime will be heard to verify exit.

The system completes the calibration process during
driving. The system normally takes 15 to 20 minutes of driving
in each of three speed ranges to "learn" tire pressures. The speed ranges are 15 to 40 mph (25 to 65 km/h), 40 to 65 mph (65 to 105 km/h) and above 65 mph (105 km/h). When learning is complete, the system will alert you after two to eight minutes if a tire is 12 psi (83 kPa) different from the other three tires. Detection thresholds may be higher and detection times may
be longer on rough roads, curves and at high speeds. The system is not capable of detection at speeds greater than 70 mph (110 km/h).

clean the throttle body most common cause of idle/decel die off. its cheap and real cheap and easy to do yourself

the right outer tierodending needs replaced.

check the wheel bearing sounds like a problem there.

syncro problem
low on oil
check stick shift adjustments
shift stick bushes or a cable problem
check engine mounts
gearbox, fork or clutch worn