Hi DavidS-UI!
Thanks for reaching Microsoft Community. We're here to help and let's work on this together.
I'm sorry to hear that you're experiencing slow boot issues with your Surface Pro 8 after joining the Windows Insider Program. Based on your update, it seems that the issue is related to the battery. Here are some troubleshooting steps that you can try:
- Check the battery health of your Surface Pro 8. You can do this by going to Settings > System > Battery > Battery health. If the battery health is below 80%, it may be causing the slow boot issue.
- Try resetting the battery calibration. To do this, follow these steps: a. Disconnect the power adapter from your Surface Pro 8. b. Let the battery drain completely until your Surface Pro 8 shuts down. c. Connect the power adapter and let it charge to 100%. d. Disconnect the power adapter and use your Surface Pro 8 until the battery drains completely again. e. Repeat steps c and d at least two more times.
- If the above steps don't work, you may need to request for a replacement. With replacement process, please contact live Microsoft support for further assistance. Below are the steps on how to contact them:
- Go to Contact Us- Contact Us - Microsoft Support.
- Choose how you would like to get support for your Surface device.
- Type in the problem you need help with.
- Look at any available solutions offered and select Contact Support.
If the above steps did not work, you can also check on Barb's step by step instructions on how to contact support How to get Phone and Chat Support (for Surface Home/Consumer - Microsoft Community.
Thanks again for choosing Microsoft. Hope this helps!
Regards,
RodelioP.