1995 E420 - Possible common ground connection?

[Midnightlsc]

As I 'm driving and mostly when taking turns or during somewhat substantial movement, multiple items malfunction. For example, the radio turns off, windows & sunroof don't work, SRS light comes on, wipers if on stop in place, heated seats turn off, power antenna lowers and rises. With further movement all these items continue to work and then stop again and so on.
My question: Is there a common ground that all these particular items are tied to? If so, would a loose terminal connection explain this situation? Sometimes it is not so apparent and at other times it is a constant nuisance especially with the radio cutting in and out.

[david s poole]

check main ground from engine to chassis at the bellhousing.also check chassis ground from battery.

[DRICHFL]

Check your fuses, also your combination relay.