Dell Laptop crashing with Premiere - what specs am I missing?

Hello,

I am experiencing freeze-ups and crashes in Premiere Pro. I have a good amount of RAM and a good processor so I'm not sure what the issue might be. Any help would be appreciated. Here are my computer specs:

Dell Inspiron B 17, 7773

16GB DDR4 (16GBx1)

512GB SSD - CL20

nVidia Discrete Gfx N17S-G1, 2GB GDDR5

Intel(R) UHD Graphics 620

NVIDIA GeForce MX150

Intel(R) Core(TM) i7-8550U, FY18C2

I wish I had the computer savvy and time to research this on my own, and I really appreciate any help. The problems often start  when I'm making colour corrections or adjustments, but they can pop up any time once I have a good amount of clips and edits going.

I also use a second external monitor...could this be the issue?

Thanks in advance!

-J