Things to do that might help:
Update BIOS/Firmware of your laptop to latest from Lenovo's product support page
Make sure you have the latest AM4 chipset drivers installed from AMD.com
Make sure you have the latest GPU drivers installed from AMD.com or Nvidia.com (whatever type of GPU you are running)
..if still microfreezing .. then check your laptop's power settings and bebop around in there and toggle some stuff and see if it helps anything