Grouped clips out of synk on timeline

I have the latest version of Premiere Pro. I use the latest version of Windows 11. 
On timeline I have a sequence which is roughly 35 minute long. There are several clips and I have grouped them, perhaps 10 - 15 in a group and it works well. Within the group I also have linked files, video clips and audio clips. 
The problem is when I open a project, make some adjustments, shorten or trim a clips or two, then use for instance "ripple delete", or carefully move a group, the following (to the right) video  and audio clip get out of synk. I'm very careful to unlock all the tracks.
Can anyone help me with this - it's a huge problem and it takes an awful lot of time to move the clips back again.