I am writing a piece and when the orchestration gets dense it tends to "dump/corrupt" instruments for the entirety of the project. For example, I have a section where the orchestration is lush with almost the entire orchestra playing. I am noticing that some instruments (winds in this case) are not playing the entire duration of their notes and give off a violent "pop" sound when cutting out. Moving on into the piece where the orchestration is not as dense the piano is not playing the entirety of its notes either with the violent "pop" sound thus making a singing piano passage sound choppy and staccato-ish, I have had this issue with all of my previous versions of Finale and Garritan and I believe someone told me that it was my RAM. Then I was running my system with 4GB but now my current system has 12GB and the issue still persists. I would appreciate any insight on what's going on and how to fix this! Thanks in advance. 

MY SYSTEM:

WIndows 10 | 512GB | RAM 12GB

Finale v26 | GPO5 | WORLD | JABB | HARPS

PS: It seems I am only allowed to fill banks 1 - 28 with instruments. If I use more I get an error message saying "Maximum RAM reached, please allot more RAM to the program" Which I do not know how or what to do so if someone could guide me through I would appreciate it