a problem with GB for years-drum loops

i have asked this before

probably started noticing it 4-5 years ago.

Let me just state that i have used top of the line MACS with optimal RAM newest OS

the problem happens frequently:

drum loops like e.g and not specific to

popGRoove Drumset 13 on its Drum track for 6 bars

will dissapear or lets say be eliminated while im working on regions.

as an example i could be at bars 50 -60 selecting all the tracks spliting the song at bar 50 and 60 and moving that to be able to insert new material in its place

i think when the drum loop at that part of the song is moved the loops in early bars leave disappear as if they were attached to the loop at 50-60

but they are not and to my chagrin i

lose the drums!!!!!!!

this happens frequently

over the years

i have asked members but no response.

i dont have a reason for it

they are regions not attached to the regions at 50-60

i cant be paying attention to the drums all the time

to be able to catch it at the moment it is happening but i should

does ANYONE have a clue whats going on here

i have the brand new IMAC 27 " 32 GB RAM 3.4 ghz intel core i7

but it happened with older mac pros and imacs and G3 etc

drum loops disappear vanish

i even think as im exporting the song they vanish

anyone please

???????????????????????????????????????????????