It is sounding like a heat problem in your A3000 making the contact weak once it warms up I would remove all the cards and clean the contacts with an eraser and then put back in one at a time and see if the problem continues. Check that the memory is seated properly again carefully removing them and then replacing them. Check the cable on your hard drives to make sure that they are connected properly and ensure that there is no leakage of the battery on the motherboard if so remove it immediately and clean up the affected area with alcohol and a q-tip.
