98 blazer 4x4 issue

I own a 98 S-10 4 Door Blazer with a push button 4 wheel drive system with no automatic 4 wheel drive button.During the 4 years that I owned it, every month or so I would push the 4 wheel drive high button and use it
for a few miles so the system would stay operational. Last winter I used the 4 wheel drive low button. that worked fine, but, a week or 2 later when I went to use the 4 wheel high it did not light up or work at all. When I put it in neutral and push 4 high, the light flashes but goes back to 2 high. The 4 wheel low button still works fine. When it is in 4 low and I push 4 high the light flashes but the system goes back to 2 high. The 4 high system worked fine until I used 4 low. Now that is all that works. Please let me know if you have any ideas what might be wrong.
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