Hill Charlie

So I have a 2006 Chevy colbolt and the other day I was driving and my doors were locking and unlocking randomly the speedometer stoped working it was being sluggish then the aintitheft came on and the car just shut down can anyone help me with this idk of it's the keys or the aintitheft itself Chevy wants a arm and leg just to look at it and I was wondering if anyone could point me in the right detection plz and thank you