Blender is freezing when using Texture painting and Weight painting.
System Config:
Processor: i7-9750H RAM: 32GB Graphics: GTX 1660Ti Max-Q,
Considering your system specs, that is a very weird thing to happen. I suggest that you should check the poly count and try to make a little low poly, because it is possible that your madel is having too many polygons for the program to handle. If this is not the case, try reinstalling blender's latest version (which is 2.82 I guess) To undo the subdivision surface modifier, use the decimate modifier with the option to Un-Subdivide.