Aftermarket radio display not working properly

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This is most likely due to what's called a "cold solder joint" in the display. This is a solder joint that is imperfect and makes poor contact. Temperature changes cause expansion and contraction affecting the joint. The solution is to disassemble and resolder the circuit board connections. I suggest contacting the manufacturer and having them recommend one of their repair facilities. This repair usually runs $50.00 to $100.00.