What's the situation with this error?

Note:
This topic has been translated from a Chinese forum by GPT and might contain errors.

Original topic: 这个错误什么情况

| username: 点点-求助来了

【TiDB Usage Environment】Production Environment
【TiDB Version】
【Reproduction Path】What operations were performed when the issue occurred
【Encountered Issue: Issue Phenomenon and Impact】
【Resource Configuration】
【Attachment: Screenshot/Log/Monitoring】
Unknown?

| username: xingzhenxiang | Original post link

Is the network between PD and KV normal?

| username: xfworld | Original post link

Lost contact with PD.