hmm… well, regardless of the relatively stable temperatures it kinda sounds to me like a capacitor went out of spec on the board. The inductance of the antenna won’t change over time really, but capacitors involve a bit more chemistry magic and bad parts can cause detuning. Since you are able to still get a read when making contact with the antenna, I would guess the tuning has gone way off target… still enough to work, but not have any range really. I don’t know if there is a simple fix here.
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