Something is running that is preventing dynamic link from opening. It could be any one of a host of programs. Open up your Task Manager (Activity monitor if you are having the same problem and are on a Mac) and check for all running programs to see which one is hanging. Then either update or uninstall the app that is causing the problem.
If you don't find anything there try purging memory and disk cache first and then allocate more memory to other apps in AE's preferences.
i just do not understand why it works initially and then stops..
I opened up task manager and under processes i see lots of things with 'host' but not sure how to tell if it is hanging or not.
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Something is probably running that eats up memory so dynamic link manager cannot open. This could be an app that you don't always open or it could be one that does not free memory as you use the system. If purging all cache in AE, allocating more memory to other apps and rebooting your system doesn't fix the problem then there may be other conflicts. Generally apps do work just fine then fail unless something else is eating up the memory or using the buss they need.