What is your laptop model number? As giving only the monitor model KG241P means nothing. Also, have you downloaded/installed the Acer KG241P's driver the "Acer Display Widget Application" Version: 3.0.2.0 dated 2019/05/27 if not, get it from here: https://www.acer.com/ac/en/US/content/support-product/7686?b=1 This Stop Error(s) has to do with the video card (yes I know you have updated drivers) but, have you installed the right driver for the GTX 1650? Also the card could be faulty (which is very unlikely) but check that also and try and do the following: 1. Uninstall all graphic(s) drivers completely off your OP system and reinstall this correct/latest one from NVIDIA for the GTX 1650 from here: https://www.nvidia.com/Download/driverResults.aspx/159888/en-us which is the 2. Check NVIDIA Control Panel Setting and set all settings to default also, 3. On "NVIDIA Control Panel Setting" if the "NVIDIA® G-SYNC settings" are "ON"? Disable them, as the Acer KG241P does not handle NVIDIA G-SYNC it only handles the AMD FreeSync™ Technology. 4. If all the above doesn't work? Then, go to the Acer site for your appropriate laptop models website and download/reinstall the OEM graphics driver that Acer has for the GTX 1650 for your laptop and see if that fixes the problem.

Watchdog errors are caused when something (like a video driver) takes over the system to do something particularly intensive (like asking the GPU to recalulate the image) then doesn't get it done fast enough. Try running the games with a bit less detail to see if it clears up.

That may be where LoL first initializes the graphics, based on your preferences. Can you get it running long enough to back those settings off?

You might be having hardware issues with the card itself. I find it tough to envision anything that the monitor itself could cause. How many and what type of ports are on your card? Can you move the monitor to a different HDMI or to a DP?