Crashing with 8 video scenes

Not used Hype for some time but yesterday the program became very unresponsive with continual crashes. I have 8 video files, average 2.5GB and a simple title. Using my iMac OS Mojave, Core i7, 32GB ram. Recognised my iPhone 8+ with Hype Reflect on same network but would not connect and became unresponsive.
Anyone else experiencing these difficulties or is my iMac?

2.5 GB … baffled. As a web project?!