Fisher 1265x becomes erratic in warm temps

[Normeleni]

My fisher 1265x works like a champ at temps below 70 but if I take it out in hot weather as soon as it comes up to temp say upper 80s plus it becomes chatty and almost useless. I opened the box and cleaned with Deox spray. Worked temporarily but then back to static and minimal ability to sound off on metal? Thoughts?

 

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