Crashing when importing session data, saving as, opening sessions, etc.

[sixpointmusic]

Hi everyone,
I'm having a strange problem.
PT often crashes when I try to import session data, save as, open(change) session, import audio, etc.
This is very random and doesn't happen every time but happens 5-6 times per day.

Basically when I work on a certain session and try to do any of these actions that requires PT to open the finder window, as soon as I see the finder window pop out, I lose control and PT crashes.

Creating a new session or opening session from scratch doesn't crash PT.

I'm assuming this is some sort of Mac file system problem or some third party app like dropbox is causing this?

I've tried these but nothing helped.
*Repaired permission and restarted Mac multiple times
*Trashed PT Preferences, AAE Preferences, com.avid.ProTools.plist, Workspace, com.avid.CoreAudioManager.plst.

Any advice would be helpful. Thank you!!

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Mac OS10.10.5
Protools 12.5.0
Mbox Pro 3
Mac Pro5,1 Mid2010
2x2.66Ghz -6-Core Intel Xeon
Ram 64GB 1333Mhz DDR3
ATI Radeon HD 5770 1024 MB