Just experienced this on DEL-YVR today. Had no issues on the outbound, but the back of my seat lost its cushioning early on the return. The lead FA (SD?) came over and did the reset mentioned in the wiki above - I took notes, and had to reset multiple times during my attempt at sleeping. When I eventually got up and mentioned the frequency of the issue, they offered to move me to a vacant seat, but at that point there were just 3 hours remaining and I was well entrenched in my pod. The crew were excellent, but let's just say that my back has seen better days. I wasn't given a compensation form - didn't occur to me to ask for one on board. What's the best avenue to write in a complaint?