Clock stuck at .39Ghz

So, I’ve noticed a slight cpu clock issue with mine. Occasionally, it’ll decide to run at .39 GHz while under load for 15-20 seconds, before slowly getting back up to normal speeds. I’m fairly sure it isn’t temp related as the cpu has run for extensive periods at 100% usage around 3.5 GHz and not had any issues, but, (as my most recent example) I was running around 25-30% utilization when it decided to clock down to .39 GHz for the aforementioned 15-20 seconds before speeding up again.

Is there anyway to find out what’s happening (like running some sort of terminal while I’m using the laptop to see if it throws an error code?). Additionally, and this could be the cause, I was running it with an egpu at the time. (should I follow the advice from this previous post?)

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