Check out blood sugar and vascular issues. If you have frequent stiffness in your calves or any numbness in your toes, either or both of these could be issues.

Have your vitamin D checked and start with pcp

For my MIL this was inner ear issues.

Also check with your doctor for DEXA scan to make sure your bones are strong in case you do have a fall.

If you're a woman, OP, it could be one of the lovely side effects of menopause. Our balance can get a little off at this point.