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the long term trend is up until we have a point of inflection on the weekly/monthly charts, could be some time. Even shorter term trend with all of the voaltility is up - higher highs, higher lows.

But why are there so many times fall-down? I mean heavy decrease...

Are they based on only fundamental news or there is something in the air?

No basis at all, its just price action, when ever we reach areas of supply and demand.

maybe there is any speculative thinking behind this, isnt??

Nothing goes straight up. The basis of technical analysis is analyzing statistics powering the price action and trying to make predictions based on probabilities.