When you say it "freezes", how long is it frozen for?
What is in these compositions you've linked to?
What version of AE (down to the last decimal)? Same question for Premiere.
What are your entire system specs? RAM, OS version, etc.
And all the rest of the questions in the link I gave.
Windows 8, 16GB ram, 120gb SSD, 1Tb HD, nvidia gtx 970, latest update of both AE and PP from CC. Creative Cloud. Im away from pc will have to check specific version later. Two separate videos used dynamic link to use the keylighting effect for transparent background. Add to other videos in pp but stops exporting indefinitly at different points. Sometimes it gets 10% done other times it gets to 80% but then stops