<KevinPFleming[m]> good luck tracking it down!
if anyone stumbles upon simillar issue i fixed it by changing the way i call usb related functions:

```rust
loop {
        if reset_pin.is_low().unwrap() {
            delay.delay_ms(10u8);
            if reset_pin.is_low().unwrap() {
                reset_into_dfu();
            }
        }

        let usb_ready = usb_dev.poll(&mut [&mut keyboard]);

        if usb_ready {
            if tick_timer.wait().is_ok() {
                let _ = keyboard.tick();
            }

            if pool_timer.wait().is_ok() {
                let event = if row.is_low().unwrap() {
                    led.set_low().unwrap();
                    Keyboard::A
                } else {
                    led.set_high().unwrap();
                    Keyboard::NoEventIndicated
                };

                match keyboard.device().write_report([event]) {
                    Err(UsbHidError::WouldBlock) => {}
                    Err(UsbHidError::Duplicate) => {}
                    Ok(_) => {}
                    Err(e) => {
                        core::panic!("Failed to write keyboard report: {:?}", e)
                    }
                };
            }
        }
    }
```