Logs are not seen

When I start to debug logs are seen only at the beginning. After app starts, logs can not be seen. What can be the problem?

LogCat connected to: B4A-Bridge: samsung GT-N7100
--------- beginning of /dev/log/main
** Activity (main) Create, isFirst = true **
** Activity (main) Resume **
** Activity (main) Pause, UserClosed = false **
** Activity (main) Resume **
** Service (service1) Create **
** Service (service1) Start **
Connected to B4A-Bridge (Wifi)
Installing file.
** Activity (main)...

Logs are not seen

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