No crank, no start

Let me start from the beginning.
I bought my car listed above (CX) a year ago about 2 months ago my car's gauges and door locks would go crazy after driving my car for about 20 minutes (only when I would press down on the gas) after 20 minutes or so when I press the gas the gauges and locks go crazy then the gauges just stop working period and locks stop. If I turn the car off it won’t start, but if I take the negative or positive terminal and but it back real fast it will start back up but when I take off it’s the same issue. I took it to the shop and they said it was my door actuator and I told him my fuel pump relay was too hot to the touch. So he changes the actuator didn’t fix it. Then he says the fuse box under the back seat because of the relay. So change fuel pump and fuse box still same thing. I get up go to the store on the corner come home everything seemed fine it took me less than 10 minutes to park my car back at home. I go out several hours later and try to start my car and nothing lights come on radio, etc. But the gauges stay put they don’t move but the car won’t even try to crank or anything. I tried taking the terminal off and putting it back but this time it is not working neither. Please help this is driving me nuts. Thanks in advance.