Intermittent sunroof problems can usually be traced to a bad connection at the motor, a dirty/corroded switch, or a bad sunroof gear.

on my 190D, the two failures have been due to corrosion at the switch.

on my 300D, the problem was a sunroof gear that deteriorated.

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Jovan

'84 (11/83) 190D 2.2 5-Speed; Silver/Blue; Motor No. 00354, 402k mi (340+kmi mine)

'89 Porsche 911 Turbo Coupe; Black/Black; 53kmi
'05 BMW 530i 6-Speed; 302kmi
'19 Range Rover; 30kmi