As of several months ago my Dell Inspiron 5577 has started to have a screen flicker. This only seems to happen when certain background "updates" are happening with Windows. This includes stuff like plugging/unplugging a USB drive, connecting a Bluetooth device, uninstalling + reinstalling drivers, and changing resolutions (there is also the same flicker on external displays). This does not happen when doing intensive tasks like editing or rendering video in After Effects/Premier Pro, heavy gaming, or other resource hungry tasks.
This happened while I was on 1803, didn't fix when updating to 1809 or 1903, I initially started out with the standard stress tests, and ran a memtest, the memtest was fine and the other two tests never resulted in flickering. Then I thought this was a driver issue, so I had updated both my integrated graphics and then my dedicated graphics, also even tried a BIOS update, No luck. I decided to take the laptop apart, do a full cleaning, re-apply thermal paste, and make sure the display cable was secure, still not fixed. I have a friend who has the same laptop that wasn't having the issue, so I tried a temporary screen-swap. it still had the flickering issue. I've fully replaced the NVMe drive with a fresh install of windows 10 with still no luck.
It's not really effecting the experience majorly, as it is pretty few and far in between. But it is distracting when it happens, I'm wanting to sell the laptop soon and this issue would probably be a deal-breaker to most people. I'm at a full loss of ideas on what to try next.