The network signal is bad. Panda can't update the version in the background when the network signal is not good, which leads to panda reading without updating the version, and only needs to change a network to solve the problem. Panda Reading is a mobile phone reading software independently developed and produced by Baidu 9 1 Wireless, which supports online book inquiry, online book classification reading, book collection and cancellation, news classification reading, news subscription classification and cancellation.