Suspension "warms up"

[bcar240]

I don't know if this is normal or not. I have a stock suspension set up right now, save for a set of slightly stiffer springs (I didn't do it) but when I first start the car it seems like the suspension is crap, the whole car shudders when I hit a crack in the parking lot and stuff like that. Feels very unnerving from the rear especially. I was also thinking it might be the drivetrain or differential. The other day I did a 180* ebrake turn (lost, angry, and turned wrong direction ) back right tire went onto the shoulder though, minimal drop, maybe an inch. but for a few seconds afterward when I accelerated it felt like one of the rear tires had come off the bead, but it went away after that. Just tryin to narrow it down. TIA