Macbook pro 15 OS10.14.6 constantly 'your Mac restarted because of a problem'

My MacBook Pro 15 inch 2018 restarted itself around once/twice a week. It usually happens when I attached to my 2 4K Dell monitors and with laptop lib close.

The restart used to happen when I unplug the USB-C to display cable . But now, it happens 10 s after I wake up the laptop from sleeping.

This is really annoying. I have heard similar cases from users who use external devices too.

I have reset SMC and tried different cables for my monitors. Nothing works so far.