Make sure the latches are clean and not full of dirt and old lube.

A MBZ friend told me about cleaning and re-lubing them.

I was doubtful but did it and it made quite a big difference and several cars.

Also check how the latches meet the store jam striker plate.

Haasman

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'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)