Crackling playback still

I bought a new computer and haven't had it a week to use this software. I now note that I get one decent uninterrupted playback when opening the score. If I stop and edit and try and playback I get the standard crackling, distorted noise noise and the blue playback cursor not playing in real time due to the distortions. Otherwise I am constantly closing the program to hear what's going on in real time. This is a new computer that exceeds specs so is this another series of problems with Muse? It's really hard to function using this.