The March spike was due to Tesla's Wave philosophy (sending cars on ships early in the Qtr and moving to local deliveries late in the Qtr).
However, I do think logistic challenges are causing deliveries to bounce up and down from month to month and there have been production lines shutdown for upgrades and some news of associates being given a week off in June to compensate for the overtime in May.
In regard to logistics, see this comment from Zach during the Q1 earnings call (my emphasis in bold):
". . . . we continue to work through the instability of the global supply chain, particularly around semiconductors and port capacities, .....We believe that this landscape is improving, but it does remain difficult, and it's an evolving situation.
I also saw news that there were car carrier contstaints which may have impacted local deliveries in June.
There have been concerns about demand but I am not concerned. May and June sales of 22k and 28k, respectively look strong to me.
I remember in late May there was a rumor that the sales orders for Tesla China dropped 50%. When the May number came in strong, the argument was that we would not see the sales drop until June. Then the June numbers came in higher at 28k.
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