I would like to ride enough to have this problem one day. Doesn’t look like happening though. Why would I take off a crank that isn’t giving any trouble? Just wipe the axle with an oily rag. The cartridge BBs I’ve had have lasted 10 years each on Old Bike. If you take off one crank at a time, you always get them back in exactly the same orientation on the taper. Ought to be snug as a bug once it’s settled in.