Bad electrical contact on the cable?

[Pupazz]

Hi, I have a problem on my W203. Non-functional ABS, ESP, does not lock the door after starting, the tachometer does not work. After cross the road bump, everything worked correct for a few minute. I can't connecting to ABS, etc. with diagnostics. No other mistakes on diagnostic. probably bad contact on some cable. there is a possible problem with poor grounding? Its possibile anyone have a similar experience or where to start looking will big help for me.

Thanks much.