Can <header> tags also be your enemy?

I just put up a few pages and they got indexed relatively quickly but I have now totally lost one. The only thing I can think of is that I put a lot of <h1> tags on the main headings. I have in total 7 <h1> tags on this page that Google is no longer indexing. I thought that this simply directs the spider to the most important keywords that I want reading before the body text and so didn't realise it would be an issue to have many <h1> tags. I then have read that duplication of <h1> tags is not a good idea as SE spiders see it as spammy.
Does anyone know anything about this?

As always, really appreciate anyone's feedback!

Cheers

H1 tag should be used as the main Heading of your page content.For sub headings you can use h2,h3 etc.
It is better to use only one H1 tag in a page.Multiple h2 or h3 tags are fine.
In any kind of heading tags, you must not stuff your keywords.It should be meaningful.Unnecessary keyword stuffing will not serve the actual purpose of Heading Tags.
But I can't say that your ranking is down due to multiple H1 tags, other reasons can be there.

Lets DIY.
You reached a page full big Headings and you moved to those headings directly to start reading some important highlighted info..soon after 1-2 lines you found another big highlighted heading and moves to there and start reading and so on.....
And at the end you realized that you have not found that what was supposed to be enveloped in those Big highlighted headings then how you react towards that page??

Same is scenario when SE crawls your web page . try to make it human friendly not search engine...they will automatically gives credit to you if you deserve.

Now come to H1, H2, Bolds , Italics all these are additional effects that offers an web page additional look into.
But irrelevant usage will always return bad impact...