You're obviously a good player but not at the GM level that your tactics score would indicate. Yes I know there's the possibility that you're a tactical genius who just has trouble with the rest of his game. The probability however is that you were "gaming" the system (along with others I'm sure) and chess.com took action. I hope in this case I'm wrong and you are simply a misunderstood tactical genius. Doubt if you'll get an answer from staff on the forums though. You could always file a support ticket...
Why did my tactics rating reset?
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whos now higher? 
Jun 9, 2016
0
#4
There are a finite number of tactical puzzles. Once you get all of them, you can solve them all as many times as you want, getting a huge rating.
I want to see a 3000+ rated player who's done a total of 1000 tactics or less.
My tactics rating used to be 3579, but today I found it at 1200! My stats were all the same, except my current rating!