Front loader washer off balance bad

Our Samsung washer is about 12 years old. No issues up to now. Our son washed a load of jeans, and when the machine got to the spin cycle, the load was too heavy and unbalanced .. so the tub was spinning slowly and off balance. The machine tried it's thing where it stops and shifts the clothes around to try again.. Can't really say for sure if this has been something building up with the machine or not..

It never corrected itself. So I pulled all the clothes out and ran a spin cycle with the machine empty. Did the same thing. All off balance and would never start spinning fast. I was hoping it would somehow reset itself or something....

I read that the counter weights could be messed up (cracked or broken?) or the spider bracket could be broken. I read/heard both issues are more expensive to fix than the cost of the machine.

I guess my question is has anyone else dealt with this, and is there some easy fix to this that I don't know about??

We already ordered a new washer/dryer set and will be installed today. I just want to know if I'm really stupid and there is a quick and easy way to fix this without having to buy another washer??

Edit.

One thing we did do is put those small furniture moving pads under the feet of the washer. The washer/dryer is stacked and slides in between cabinets in our laundry room. The feet makes it easier to slide the set out, and it also dampens the vibrations. Our laundry is upstairs and you can feel it lightly vibrate the house when it's going.

Not sure if there's an issue there.