It's not uncommon to happen with IPO's, where it gets a large amount of volume following listing as people that got in on the IPO sell their shares sometimes for a quick profit or loss, and then volume drops off a bit as people try to determine a fair value. Sometimes the volume picks back up after a dip, sometimes it does not.
Look at the vast majority of stocks at their IPO and the trading after immediately listing, and you will see similar action. Volume spiking initially before dipping in the following days or weeks.
Hope that helps.
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