A quick update. I updated the firmware on the board to SPARKFUN_PROMICRO-20241129-v1.24.1.uf2 (latest stable release from micropython.org) and all seems good so far. I’ll continue testing and keep the thread open. The basic thing I saw in the release notes for v1.24.0 was “numerous bug fixes…” for the RP2xx0 build presumably to support the RP2350 which came with that release. So I can only think that what I was experiencing on the previous build got fixed in the later releases…
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