You can use a piece inexpensive rubber matting, sold for this purpose, under the rug.
First thought is, how are you washing the rug? Putting it into the dryer will help to dry out the rubber ... also storing rubber back rugs in the closet will make the back deteriorate too.
This article may help: https://homeguides.sfgate.com/repair-rubber-backing-scatter-rugs-101769.html
You can use a piece inexpensive rubber matting, sold for this purpose, under the rug.
First thought is, how are you washing the rug? Putting it into the dryer will help to dry out the rubber ... also storing rubber back rugs in the closet will make the back deteriorate too.
Letting rugs air dry will extend the rugs life!
Try putting the rubber mats that are made to place under rugs. I've used them for all the rugs in our home and work great!