What is the reason why the logcat automatically disappears during eclipse debugging?

============ Problem Description ============

Logcat out of the information, a few seconds after the automatic disappearance. It disappears every time you haven't seen the wrong message!
Some people say it is because the content is too many reasons, but it seems not, my own system.out only a few information, but also out of a few seconds to automatically disappear!
There's one more question.Is that eclipse does not recognize the real machine and must be powered on with 360 mobile phone assistants/or pea pods to identify the real machine. Some people say it may be 360 mobile phone assistant and pea pod reason, I tried to unload two, drive also unloaded load, or not, can not identify, Adb.exe I also went to the Internet to download a replacement or not!!!!!!!

============ Solution 1============

Settings can set the number of Logcat cache, I set 50,000, enough

============ Solution 2============

Reference 13 Floor K_lord's reply:

Reference 8 Floor i_am_studying reply: Reference 6 floor K_lord reply: Reference 3 floor i_am_studying reply: Logcat information Inside more than 10,000 looks like from the first printing began to clear, is this reason?
No, to my own system.out print out of things only a few, but also out of a two seconds to automatically clear! Maybe it's a lot of other programs in the tablet that print too much information, you see all messages

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The official website of the mobile phone product has the following

What is the reason why the logcat automatically disappears during eclipse debugging?