Acrobat X intermittently won't launch, multiple Acrobat.exe processes hanging in task manager

Apologies if this is in the wrong community area - I was unsure where it belongs.
This is an intermittent issue, but does happen several times a day.
Regardless of what method is used to launch Acrobat (double-clicking a PDF, clicking the shortcut in the taskbar, selecting Acrobat from the start menu), often the application won't launch. Upon investigation, task manager shows multiple instances of Acrobat.exe, although the application is not running (see the image below). Ending all Acrobat.exe processes does allow Acrobat to launch.
Any thoughts as to what might be causing this, as well as a more permanent fix? The workaround of constantly ending multiple processes is becoming cumbersome.
We are running Acrobat X Pro in Windows 7. I also have several CC 2014 apps installed (as well as a couple of earlier versions required for plugin functionality).

This happens all the time in my company with several installs of Acrobat.
The only way to fix this for us is to end each process in Task Manager as you have pointed out.
It is very time consuming in our workflow as we each operator deals with hundreds of PDFs daily, and has to do this End Process procedure several times a day.
We have done several tests and nothing seems to stop this from happening.

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