EPC and check engine lights been on for few days

Should I bring to workshop?

Funny thing is, the car automatically "healed" overnight

the check engine light will be off the next morning

so I assume it has no prob for the past few days

just kept driving it

then today while speeding until 180 kmh,

suddenly both EPC n check engine lights turned on,

whole car started to rattle like one dog

low gear especially creates big vibrations

have to go up to D6, D7 only can reduce the vibrations

What could possibly be the problem?