Each white vertical lines represent the end of each syndicate event on crypto.com/exchange
If you noticed, during that same time, CRO would dump and for simple reasons as CRO is coverted into other altcoins during this syndicate event, triggering a sell off.
Later, people would sell their altcoin back into CRO to participate in future syndicate events with more CRO coins to spare, causing prices to return back to their usual prices or even higher.