Last night's message just arrived today.

Generally speaking, this is related to network signals. Either his signal is bad or yours is bad. Sometimes you see that the signal is full, but the real situation is not like that. Just like you sometimes have a mobile phone connected to the Internet, sometimes it's faster, sometimes it's slower, and even online failure is the same. So, don't worry, don't think it's the phone, but if that phone is old, it's another matter ~ ~ ~ ~