Like I've said:
1) dirty connectors
2) worn, loose connectors in the connector inside of the machine itself (the one the game plugs into).
3) mostly likely a little of "1" and a lot of "2".
You can order the connectors from a number of online parts and game accessories dealers. They range from around $6.50 - $12.50, US Dollars + shipping. But, if you can't find a good used NES - that doesn't suffer the same fate - for less than about 18-20 dollars you'll find the investment well worth your money. Plus, you'll find that they are very easy to replace. Only a #2 Phillips screwdriver is needed - no soldering. Just pay attention to how the carriage mates to the front of the main circuit board and be sure to put the little tab on the bottom side of the circuit board when you reassemble the unit.
Personally, I restore (rather than replace) the connector whenever possible. To do so was a technique I had to perfect with practice and experimentation over time. So, if you don't plan on replacing the connector then I wouldn't advise trying to tighten and restore the contacts unless the machine won't run any games at all. The most you can hope to do (short of replacement) is to clean it well with contact cleaner and push a clean cartridge in and out a number of times (with the power off) then wipe the game's contacts clean with a cotton swab. Rinse, lather, repeat until you are able to get good, clean connections.
I also take the games themselves apart and truly clean the contacts, something that you can't really do properly with only using cotton swabs. You just need the correct bits to get the screws out.
Careless "restoration" will only lead to a machine that doesn't read any carts until a new connector is installed. The same holds true for over-tightening the contacts.
Sometimes you might find that a given machine reads the cartridge only when the carriage is not pressed down. That's also a sure-fire sign that the connector is shot. And if the game doesn't feel tight and snug as you insert and remove it; that's also bad connector.
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