Loose wiring maybe

I leased a car through Carhop and it started having electrical issues, which were, not surprisingly, not covered by the warranty. It wasn't a big deal because it only happened once in a blue moon, but now it's happening quite a lot. When it happens, my dashboard turns into a haunted house, my gauges go absolutely nuts, I get fifty different warning messages popping up, I can't get a read on my coolant temperature, my power steering sometimes goes out, the A/C doesn't work, and the car lurches around every time it switches gears (automatically).