This is what happened to me (and what I reported above).
This is why I replaced all 4. They were all original and so nearly 12 years old afaik, and I guess from the results after, one of the reasons old(er) cars lose performance.
Yeah I wanted to replace all 4 but the guys on here Insisted it was pretty stupid of me to do so....
I will have a full new set by Tuesday so hopefully all goes well the cars back on the road and touch wood no more problems! I'm sure it's going to feel more responsive too.