yes that is the nature of bitcoin that some time when the demand increase the price aslo increase and when people start selling bitcoin the price also drop to some lower level and some time we book lost.
Well, I think the price of bitcoin down it is a natural thing. but I believe the price of bitcoin is currently rising, because soon the end of the year, so a lot of people who invest their money into bitcoin. bitcoin prices already back up, and this will probably be a high price. if there is a decrease i guess it is a matter of course, because it is one of the advantages of the bitcoin