been happening for bout a week now. ill be driving down the road and all my dash lights, low oil, low trac, tcs off, so forth and so on, will all come on for about 2-3 seconds...it seems to happen when i hit a bump in the road. its like something is loose. also when it happens my speedometer will drop like 5 miles and hour for like a split second and then shoot right back up. i have no idea where to start!

PLEASE LET ME KNOW!