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It looks a lot like overwatering. This is a succulent, and will be happier with drier conditions. Make sure this is a well draining soil, and not a thick soil. A northern facing window may not give enough light to keep it happy, though. If you can, I would find a place that gets more sunlight.

https://www.gardeningknowhow.com/ornamental/cacti-succulents/string-of-pearls/caring-for-string-of-bananas-plant.htm

It may need water. These plants are tricky in finding just the right amount of water, but they do take more than other succulents that prefer minimal water. Improper lighting can cause pale, scraggly stems. String of bananas needs bright light indoors. These articles should help with its care:

https://www.gardeningknowhow.com/ornamental/cacti-succulents/string-of-pearls/caring-for-string-of-bananas-plant.htm

https://yardandgarden.extension.iastate.edu/how-to/growing-succulents-indoors

It very well could be grasshoppers! They can be difficult to control, and insecticides are just barely effective if you use them constantly. In this case, I would go with microbial warfare. Nomesa Locustae is a neat little single celled organism that will infect grasshopper and kill them off quite effectively. It is harmless to you, but will protect plants very well. You might try your local garden centers, but you may end up having to find sources online.

https://www.gardeningknowhow.com/plant-problems/pests/pesticides/nomesa-locustae-in-gardens.htm

https://www.gardeningknowhow.com/plant-problems/pests/insects/grasshopper-control.htm

Along with grasshoppers, it could be lack of sunlight. I don't see any dropped leaves, though. Unless they were cleaned up already, it is likely that something ate them. If you have it in full shade then give it more light, for sure. It doesn't need full sun, though. That will make them drop as well. If there is any information you can add in another post, then I'd be glad to keep trying to figure out, exactly, whats wrong. Unfortunately, it could be any of those. Just make sure you have good drainage, and let it dry out pretty well at the surface between waterings. Not completely dry, but definitely dry at the surface. Give it some morning sun, and mostly shade afternoon. You can trim and start new ones, as well as rejuvenate the mother plant.