I'd check the board on the pictures above. Soldering castellated modules to PCB pads is IMO a pretty sketchy practice. Fine for a one-off on the bench to experiment, but not exactly production stuff. I'd check the solder joints for cracks or other problems. Maybe just resolder (reflow with leaded paste and hot air if possible). The next is to inspect the antenna trace. And check the supply voltages (on the test points).
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