1999 Hyundai Sonata 2.4L P0340 Camshaft Position Sensor Issue: Causes, Symptoms & Fixes

My 1999 Hyundai Sonata 2.4L recently started triggering trouble code P0340 for the Camshaft Position Sensor. This issue first appeared after a previous replacement of the Crankshaft Position Sensor — which required removing the timing belt. After replacing that sensor, the car ran smoothly for about three months without any codes. However, the same P0340 code reappeared. Upon inspecting the new crankshaft position sensor, I found significant damage: the plastic housing near the wire entry was cracked and slightly melted, and the internal magnetic component was missing. I replaced the sensor again, but after only about 6 miles, the engine began to bog down and eventually stalled. It would not restart immediately — however, once the engine cooled down, it started normally with no codes until it warmed up. At that point, the same P0340 code reappeared, along with a separate cylinder misfire code for #4. I suspect overheating may be contributing to this issue. I noticed a radiator leak and low coolant levels. I temporarily patched the leak and replaced the camshaft position sensor (also removed the thermostat as it appeared worn). After running the car at high RPM for 20 minutes, it bogged out again and triggered P0340 once more. Could this be related to a faulty ECU? I don’t believe so — the issue only occurs under high-temperature conditions. I’ve already replaced the timing belt and water pump when I first purchased the vehicle, and I’ve double-checked all mechanical alignments. Everything appears correct, so I don’t suspect a timing belt problem. What should I do next? Are there known common causes for this P0340 issue in 1999 Sonata 2.4L engines? Any recommendations on diagnostics or sensor replacement? Thanks for any insights.