Pro tools 2018.10 Delay compensation shifting

[kayaman]

Hi,

I upgrade my pro tools HD 12.8.3 to Pro tools 2018.7 ultimate and after 2018.10. I have a big problem of delay compensation shifting during the playback. When i start playing the session all is ok. After a time when i add new plug-in remove some one i heard my hithat sound change or in other session if i double the voice track for different fx i can heard the same phasing sound.
If i go to the buffer size and change it all come back ok for a time but after more change of plug-in, routing ect... the problem come back.
I never notice this problem with PT 12 and can't find a solution. Don't have this problem on 2018.10 native with my macbook.

Configuration:

OS X 10.12.6
I7 with 16 GO of Ram memory
SSD for system and session drive
One HDX card with two 192 and one HD IO

Thanks in advance for the help !