Thanks for the details. It looks like you could use the Dell driver update
tool and get the latest BIOS and nVidia driver, each of which is marked as Urgent. I think there will be other updates available as well.
If the problem persists, you may want to use File | Pack Project Materials and upload the project contents to a cloud folder on Google Drive, Dropbox or OneDrive and share that with CL tech
support so they can see if they have the same issue on their end. You can also share a link to the packed project here if you're comfortable with other forum viewers accessing the clips and letting them see what happens on their systems. See this
FAQ for more info.
I had similar problems occur with PD17 and I had to add quick audio fades or volume keyframes at the beginning or end of specific clips to prevent the glitches. I never determined the cause, and I don't know if it was the specific clips I was working with or if the next update solved the issue, but that might be a workaround for you now.