Deflating seat only happened to me a few times over the past year and a half. But I have noticed that the "deflating seat" issue seems to be more widespread and frequent. On 2 recent TPAC flights, my seat deflated. I informed the SD each time. I used the "reset" function a couple of times and was able to remain in my seat.
For one of the flight, maintenance came on board prior to departure and I had an interesting chat with the maintenance guy. Apparently, they are having several issues with those seats; not only deflating problems (either the bladder, the pump or the valves are not functioning) but also with the up/down of the footrest.
As suggested by others, I will write to AC CS (not expecting anything) just so they know how widespread the problem seems to be as I think it can be useful if they want to build a case against the seat manufacturer.