Since March 2021, the quality problem of Xiaomi 11, a high-end mobile phone product of Xiaomi, has been complained by consumers continuously. Recently, it has been hot on microblog for two consecutive weeks. As of press release, Xiaomi officials have not given a clear response to the quality problems of Xiaomi 11 series. According to the reporter, the recent heated discussion about the quality problem of Xiaomi 11 is due to the official modification of the after-sales policy, which changed the previous replacement policy to "only repair but not replace". According to the new policy, since September 15, the follow-up customer complaints of Xiaomi 11 only support mainboard maintenance services, not replacement and return. If customers insist on returning goods, they can support customers' 12315 complaints. If customers affect the on-site operation of the store, they can give an alarm. As of press release, Xiaomi officials have not responded to the internal announcement. Xiaomi told reporters that for the quality problems fed back by users, the government has provided after-sales service according to the "three guarantees" policy, but Xiaomi 11 has now stopped production. The reporter called Xiaomi customer service and learned that Xiaomi 11 is out of production, so it is unable to provide replacement service, but it has relevant parts, so it can provide repair service. According to the official report of Xiaomi, at present, Xiaomi 11, Xiaomi 11 Ultra, Xiaomi 11 Pro, Xiaomi 11 Youth Edition and other models are still on sale. At the beginning of 2021, many Xiaomi mobile phone users applied in the Lei Jun Weibo comment area to solve the quality problems such as Xiaomi 11 burning the motherboard, WiFi and black screen. A person engaged in chip level maintenance of mobile phone motherboard told China Business News that the so-called burning of the motherboard is the damage of a chip, capacitor or diode in the circuit on the mobile phone, which makes a function of the mobile phone unusable. The main board may be burnt due to incorrect charging method, use of non original charging equipment, failure to timely handle water ingress into the mobile phone, aging of electronic components of the mobile phone itself, and damage to the main board caused by poor battery heating. In June 2021, Jin Fan, then Xiaomi's product director and general director of MIUI experience, responded to Xiaomi's mobile phone fever in Xiaomi community, and he summarized that mobile phone fever mainly focused on four scenarios - game fever, video call fever, video fever and charging fever. In Jin Fan's opinion, the reason for the popularity of Xiaomi's mobile phone is mainly related to four aspects. First, Xiaomi's hardware is of high specification, which brings about higher power consumption in terms of performance scheduling; Second, the increase of charging power brings the risk of heating; Third, the application of 5G SA by the operator made the previous optimization methods ineffective, and increased the risk of heating; Fourth, because the weather is getting hot, the temperature of mobile phones is also starting to rise. However, in terms of specific solutions, Xiaomi officials have not provided the reasons and fundamental solutions for frequent quality problems until this official after-sales policy change. Lin Zhi, the chief analyst of Wit Display, told the reporter that after more than a year, the quality problem of Xiaomi 11 was hot again. The reason may still be that the previous quality problem had not been effectively eradicated - in order to reflect thin, the internal parts were arranged too closely, which led to problems in heat dissipation and a chain reaction. While consumers continuously and repeatedly exposed the quality