Flickering/Intermittent charging under load (2018 Blade 15" Advanced)

I'm hopeful someone has a fix or at least a path to me resolving this issue. The couple of posts I've seen relevant to this one don't seem to go anywhere beyond the initial support comment. I have noticed while under full load (usually while gaming), the system power will switch back and forth from plugged in to the battery several times for maybe 20-30 seconds at a time. So far I've tried:

• Rebooting (no change)
• Getting more airflow by propping up the rear of the system while gaming (no change)
• Cleaning fans and heat sinks of any visible dust and obstructions (they were both largely clean, and the flickering back and forth continued after)
• Running the system on battery power only to try playing while charging from a lower percentage (still flickering)
• Removing the battery and running only on AC power (the system shuts off completely when under load and the flickering would have occurred)
• Updating EC (no change)
• Updating BIOS (BIOS updater says installation successful, but the BIOS still reads previous version)

The AC adapter doesn't appear to be losing power at any point. I've run it on a surge protector and direct from the wall, and while the housing does get a little warm while under load, it never gets overly hot, and the LED indicator doesn't flicker or show any sign of losing power. My battery isn't swollen, and I'd say I had pretty mild use of the laptop as a whole up to this point. I only recently started gaming more heavily, which is why I've started noticing this trend. I'm beginning to worry this may be a motherboard issue, or some smaller surface mount chip I don't have the equipment or skill to replace.