6 month old SMP 300 Diver 9900 gradually slowing down.

I got the watch new in March and it was running spot on not loosing or gaining any time for months. In the last month I noticed it is starting to loose time gradually. At first it seemed about -0.5 second a day and now seems to be loosing about 0.75 sec a day. its still within spec but is this something that will get worse indefintly? Will it eventually start loosing 2 seconds then 3,4,5,10,20, 30, 60 100 and so on? Wearing habits have not changed. It stays on the winder mostly as I rotate with other watches. thanks

My new AT runs -1 in a week. If it goes more -1 slow a day, I will probably take in if were in your shoes.

I have a question for all, once a piece has been opened or serviced, will it void the then Meta’s verification?

Loosing a second a day is within spec and doesn’t bother me. I just wonder if it will progressively keep losing time to several seconds a day and so on.