For the charging heat issue on both devices:
- Surface devices can become warm while charging, but if the heat is excessive, first check Windows Update and install all available Windows and Surface firmware updates.
- If available, test with a different official Surface charger. If the overheating happens only with one charger, replacing that charger is the next step.
- On the Surface running Windows, reducing plugged-in CPU load can help: Control Panel > Power Options > Advanced Settings > Processor Power Management > Maximum Processor State, then set the plugged in value to 99%. This can reduce heat by preventing turbo boost.
- Smart charging on Surface is designed to protect battery health. It can automatically limit charging to 80% when the device is plugged in for prolonged periods or used at elevated temperatures.
For the Surface Pro screen problem from 2018:
- The circular bubbles and display instability point to a screen or hardware issue that needs to be checked.
- Start by testing whether the problem appears in UEFI:
- Shut down the Surface and wait 10 seconds.
- Press and hold Volume Up.
- While holding Volume Up, press and release Power.
- Keep holding Volume Up until the UEFI screen appears.
- If the bubbles, shaking cursor, or distortion also appear there, the issue is hardware-related.
- If the issue does not appear in UEFI, update display-related components:
- Open Device Manager.
- Expand Monitors and uninstall the Surface panel/display driver.
- Uninstall the graphics driver.
- Restart the device.
- Go to Settings > Windows Update and install all available updates.
- If the issue still continues, use Settings > System > Recovery > Reset this PC and choose Cloud download.
- If the distortion appears in UEFI or remains after updates/reset, request service or repair.
For service and repair:
- If the screen has physical damage, is out of warranty, or needs hardware repair, use the Surface service and repair options.
- If the device battery has expanded or the screen is being pushed open, stop using the device and submit the swollen battery form immediately.
For Windows 11 eligibility on the older Surface:
- Not all older Surface devices can upgrade to Windows 11. Devices that are not eligible include Surface Pro 4 and Surface Pro (5th Gen). Eligibility depends on the exact model.
- Windows 10 support ended on October 14, 2025. Moving to Windows 11 is recommended only if the specific Surface model is supported.
No supported information confirms a free replacement power cord program for these symptoms.
References:
- Which Surface devices can be upgraded to Windows 11?
- Get help with Surface screen issues
- Smart charging on Surface
- Surface 5 Gets Hot When Charging Battery - Microsoft Q&A
- Vertical red squiggly lines on Surface Pro - Microsoft Q&A
- Surface Studio help & learning
- My battery expanded in my Notebook and popped open the cover. This is not good - Microsoft Q&A