These phones are extremely durable. The most likely cause is a bad handset cord, which is a standard modular type and easily replaced, or possibly just a bad handset, which is proprietary. (The handset cord connection at the handset is hidden by a snap on cover you can remove with a small screwdriver or fingernail file. Pry it just above the cord as it enters the main handset body.)
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These phones are extremely durable. The most likely cause is a bad handset cord, which is a standard modular type and easily replaced, or possibly just a bad handset, which is proprietary. (The handset cord connection at the handset is hidden by a snap on cover you can remove with a small screwdriver or fingernail file. Pry it just above the cord as it enters the main handset body.)