That's a well documented problem with the DS tracks. I used to built on commission. I really feel sorry for those who bought my items before I found out about the problem and quit using them and had the tracks split a few years later (by reports, some didn't even last that long).
I don't understand why Dragon ain't switching back to having both options included like they did in the past, so the modeler can decide what to use. Their overpriced kits do totally cry for this feature.
I feel your pain, I have opened kits that I bought in 07, 08, and found the same issue with the tracks. With the price of Dragon kits these days, they could well afford putting both magic and DS in the box. I miss the early premium kits with etch, metal barrels and magic tracks. It makes me wonder how Dragon can justify the high cost of recent kits with no extras in the box and giving us these terrible DS tracks which have been shown to be useless and unusable for such a long time.
How old are yours? I think my examples in the picture are also around 10 years.
As said, I don't have exactly a problem with this phenomenon, as I don't use them anyhow. I have have an affection for friultloops. It was more of an illustration for others what they might have to expect from rubber bands.