Puck sending same key repeatedly?

So, I've been doing more testing. I've upped the delay to in my setTimeout() to 500 - still getting errors.

Most of them are caught, so it doesn't brick the button:

caught:{"message":"Got BLE error code 12292","type":"Error","stack":" at line 38 col 8\n      });\n       ^\n"}

Per this error code, I've found this other post: https://devzone.nordicsemi.com/f/nordic-q-a/6222/stability-in-the-uart-communication-over-ble

Eventually, the button just gives up entirely, the exception can't be caught...

Uncaught Error: Got BLE error code 12292
 at line 37 col 10
        });
         ^
in function called from system
New interpreter error: FIFO_FULL
WARNING: jsble_exec_pending: Unknown enum type 46
WARNING: jsble_exec_pending: Unknown enum type 46
WARNING: jsble_exec_pending: Unknown enum type 46