Nintendo 64 issues including briefly showing no controller message

Picked up a Nintendo 64 console at a yard sale this past week. Noticed a few issues I am not all that familiar with. One is the no controller message. If the console has been turned off for awhile, then I turn it on, it will show no controller, but then within like 10 seconds the message goes away and the controller works just fine. Does the same thing with 2 different controllers. I did open the console up and looked at the solder points on the first controller connections to see any cold joints. They seem ok to the naked eye. Should I just try a reflow just in case?

Another issue is, I think there is something wrong with the shell. Game cartridges have a very tight fit going into the slot. Even if I took off the plastic piece inside and the 2 opening doors and just had the opening for the cartridge, it goes in super tight. You have to even pull the cartridge out with a lot of force. The console is a US model and the games are US games, so I know it's not a Japan thing.

Could it be the plastic might have warped? It looks normal. I never came across an issue like this. Another issue is the power button, sometimes when turning it off, the power stays on. I have to slide the power button up then back down to get it to finally turn off. Doesn't happen all the time. I took the console apart and took the button out and cleaned it and cleaned the console part where the button slides into. I also cleaned around the button itself. Still, same issue. Not constant, it randomly does this. Never seen issues like this with a N64.

Even the memory pack cover does not fit properly. It wont clip in and stay attached to the console. I had a spare one from another console and that too has the same issue. Very weird. It is just a basic N64 console. I dont see any mods or anything like that.