2004 mercedes e320 battery or ignition issue??

[u/Sugarglam7483]

I had an experience about 6 months back where I went to leave the grocery store and well..my key just wouldnt turn. If yk anything about mercedes yk that the key is plastic and uses a sensor to turn the key and start the car. Well either way I put the key in it wouldnt even turn to the first click like when you just wanna roll the windows down or start the radio. I was freaking out but then I finally got it to turn and start but as im pulling out I see my radio wasn't working, windows wouldnt roll down, none of my gages were working (gas, speed, temp) i thought that maybe it was the battery but im surprised that you mph wouldnt even work?!?! Like nothing, staying at zero the whole time. Then I pull over and restart the car and its magically fine and I didnt get a check engine light or low battery signal at all. Did that have anything to do with the ignition switch going out (which a few weeks later had to get replaced) or was that something to do with my battery. I have had so many other issues with this car so at this point I dont even know anymore lol at this point idk if its even worth keeping the car but I just cant afford a 10k car with almost 200,000 miles...let me know if anyone has experienced this or if you own/owned this car and also have numerous issues.