Teensyduino doesn't include the latest FlexCAN_T4 library, so make sure you get it from here: https://github.com/tonton81/FlexCAN_T4
When enableInterrupts is set in setup, events() should be removed from the loop.
Glad you got it working.
I had been experiencing related issues prior to the FlexCAN_T4 commit on June 20 (AKA Update7), so my money is on that.
Tony - that commit barely missed inclusion into Teensyduino 1.53 and...
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